v/v Concentration is a type of concentration in which we use to determine what would be the percentage of a certain volume of solute (the one with the least volume) by a certain volume of solution (the one with the most volume). The formula for this will be:
%v/v = volume of solute/volume of solution
In this question, we have:
%v/v = 8.7%, which is 0.087
volume of solute = 34.2 mL
Now we add these values into the formula:
0.087 = 34.2/v
v * 0.087 = 34.2
v = 34.2/0.087
v = 393 mL of ethanol solution that contains 34.2 mL of ethanol
Use the chemical equation to complete the activity.
2Cu+S→Cu2S
Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.
The law the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide is law of conservation of matter
Law of conservation of matterThe law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
The above law suggest that the total mass of reactants must equal to the total mass of the product obtained in a chemical reaction.
With the above information, we can obtain the mass of Cu₂S as follow:
2Cu + S → Cu₂S
Mass of Cu + mass of S = Mass of Cu₂S
12.7 + 3.2 = Mass of Cu₂S
Mass of Cu₂S = 15.9 grams
Thus, from the above illustrations, we can conclude that the law the scientist used was the law of conservation of matter
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Given the system at equilibrium: N2O4(g) + 58.1 kJ <----> 2 NO2(g) What will be the result of an increase in temperature at constant pressure?D) The equilibrium will shift to the right, and the concentration of NO2(g) will increaseA) The equilibrium will shift to the left, and the concentration of NO2(g) will decrease. B) The equilibrium will shift to the left, and the concentration of NO2(g) will increase. C) The equilibrium will shift to the right, and the concentration of NO2(g) will decrease.
STEP-BY-STEP EXPLANATION:
Given information
[tex]N_2O_{4(g)}\text{ + 58.1KJ }\rightleftarrows2NO_{2(g)}[/tex]From the given reaction, you will see that energy is added to the reactant side. This implies that the reaction is an endothermic reaction.
An endothermic reaction is a type of reaction in which heat is absorbed from the surroundings.
Recall, Le Chatelier's principle states that when external constraints such as (temperature, pressure, and concentration) are imposed in a chemical equilibrium system, the equilibrium shift so as to annul or neutralize the effect of the constraints
When temperature is
Samples of two metals of equal mass but with different heat capacities are originally at the same temperature. Il the same amounto1'heat is added to both samples, for which metal will the final temperature be lower (assume that no phase change, such as meltng, occurs).
The heat capacity corresponds to the energy needed to raise one degree of temperature for one gram of substance. That is, the greater the heat capacity, for the same mass, the greater the energy required to raise the temperature of the material.
Therefore, between the two metals with the same mass, the same initial temperature, and the same heat added, we can say that the one with the higher heat capacity will present a lower final temperature.
Answer question number 3. The question is in the image.
ANSWER
Octyne
EXPLANATION
Generally, an organic compound that has triple bond is called alkyne
The general formula for alkyne compound is given below as
[tex]\text{ C}_nH_{2n}[/tex]Where n is the number of carbon atom
[tex]\begin{gathered} \text{ n = 8} \\ \text{ C}_8H_{2\times8} \\ \text{ C}_8H_{16} \end{gathered}[/tex]Therefore, the answer is octyne
15.11 + (142 x 16.5) what is the solution to the correct number of significant figures
Answer:
2358
Explanation:
the whole answer is 2358.11
What Mass of Lithium nitrate would have to be dissolved in 30.0g of water in order to make an 18%. Solution?
The mass of lithium nitrate that needs to de dissolved in 30.0g of water in order to make 18% solution is 6.58 grams.
The Percentage Concentration of a solution is the calculation of concentration of an element in a solution using the masses of solute/solvent and solution. It can be defined by the formula:
=> Percentage = (Mass of solute/Mass of solution)*100
The density of water is 1 gm/cm³, so the mass of 30.0g of water is 30ml. 18% concentration is given. The formula for percentage of concentration is given as
Percentage = (Mass of solute/Mass of solution) × 100
Here, Mass of solute is m, Mass of solution is m+30, and percentage is 18, So we get
=> 18 = (mass of solute/Mass of solution) × 100
=> 18 = (m/m+30)*100
=> 18(m+30) = m
=> 18m + 540 = 100m
=> 82m = 540
=> m = 6.58
Hence, the mass of lithium nitrate dissolved in 30g water to make 18% solution is 6.58g.
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Use the reaction below to determine how many liters of H2O(g) result when 2.7 grams of CH4 are combusted in excess oxygen. The temperature after combustion is 380K and the pressure is 1.5 atm.CH4(g) + 2O2(g) > CO2(g) + 2H2O(g)
1) Write the chemical equation.
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]2) List the known and unknown quantities.
Sample: 2.7 g CH4.
Temperature: 380 K.
Pressure: 1.5 atm.
3) Convert grams of CH4 to moles of CH4.
The molar mass of CH4 is 16.0425 g/mol.
[tex]mol\text{ }CH_4=2.7\text{ }g\text{ }CH_4*\frac{1\text{ }mol\text{ }CH_4}{16.0425\text{ }g\text{ }CH_4}=0.17\text{ }mol\text{ }CH_4[/tex]4) Moles of H2O produced from 0.17 mol CH4.
The molar ratio between CH4 and H2O is 1 mol CH4: 2 mol H2O.
[tex]mol\text{ }H_2O=0.17\text{ }CH_4*\frac{2\text{ }mol\text{ }H_2O}{1\text{ }mol\text{ }CH_4}=0.34\text{ }H_2O[/tex]5) Volume of H2O produced in the reaction.
5.1- List the known and unknown quantities.
Moles: 0.34 mol H2O.
Temperature: 380 K.
Pressure: 1.5 atm.
Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1)
5.2- Set the equation.
[tex]PV=nRT[/tex]5.3- Plug in the known values and solve for V (liters).
[tex](1.5\text{ }atm)*(V)=(0.34\text{ }mol\text{ }H_2O)*(0.082057\text{ }L*atm*K^{-1}*mol^{-1})*(380\text{ }K)[/tex][tex]V=\frac{(0.34\text{ }mol\text{ }H_2O)(0.082057\text{ }L*atm*K^{-1}*mol^{-1})(380\text{ }K)}{1.5\text{ }atm}[/tex][tex]V=7.1\text{ }L[/tex]7.1 L H2O was produced from 2.7 g CH4 in the reaction.
How do u do question 1b. Explain fully because i only got one mark from my answer here:Nonmetals will not conduct electricity on their own, but nonmetals from group 7 are very electronegative, and they are very likely to make bonds with metals from group 1 and 2, and these bonds will likely be ionic bonds, in which we have ions involved, and this is the case when we have conductivity, so if Bromine form a bond with metals, it will make ions and these ions when dissociated in a solution will cause the solution to conduct electricity.
A) The melting and boiling point of a compound depends on the elements, the bonds that form the molecule, and the geometry of the compound, so two compounds with a similar structure can have similar melting and boiling points.
Fluorethane has the molecular formula C2H5F, so poly(fluoroethane) may have a similar boiling point since its structure is similar.
B) This is because when a bond is formed, the chemical and physical properties of the compound change because there is a rearrangement of the electrons. So all the compounds that contain bromine will not have the same properties but it will depend on the elements with which they are linked and the type of link between them. If bromine bonds with an element with low electronegativity, such as a metal, for example, an ionic bond will be formed. This ionic bond with metal will give it different electrical properties and this compound can conduct electricity.
chemistry homework help - letter BHot air is less dense than cold air and this si the reason that hot air balloons float. A hot air balloon on a cool summer morning is filled with air to a volume of 2.60x 10^6L and warmed to 195 degrees fahrenheit(90 degrees celsius). A hot air balloon must be inflated to a volume of approximately 2.80x10^6L in order to float in air. a. At constant pressure, provide a molecular level explanation of the relationship between temperature and volume of a gas.B. Calculate the temperature the gas must be in(celsius in order to float).
Answer: the volume air necessary must be at 117.93 °C to float
Explanation:
The question requires us to determine the final temperature of air in order to float in a hot air baloon, given its initial temperature and volume and the volume necessary for the baloon to float.
The following information was provided by the question:
initial volume = V1 = 2.60x 10^6 L
initial temperature = T1 = 90 °C
final volume = V2 = 2.80x10^6 L
Considering that the pressure remains constant, we can apply Charle's Law, which matematically states the relationship between temperature and volume of a gas at constant pressure:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]Rearranging the equation to calculate the final temperature, we'll have:
[tex]T_2=\frac{V_2\times T_1}{V_1}[/tex]Note that the temperature must be used in Kelvin, as it refers to the absolute temperature of the gas. We can convert the initial temperature given from °C to K as:
[tex]\begin{gathered} T(K)=T(°C)+273.15 \\ T(K)=90°C+273.15=363.15K \end{gathered}[/tex]And, applying the values provided by the question:
[tex]T_2=\frac{(2.80\times10^6L)\times(363.15K)}{(2.60\times10^6L)}=391.08K[/tex]And we can conver this temperature from K to °C as:
[tex]\begin{gathered} T(K)=T(°C)+273.15\rightarrow T(°C)=T(K)-273.15 \\ T(°C)=391.08-273.15=117.93°C \end{gathered}[/tex]Therefore, the volume air necessary must be at 117.93 °C to float.
2.04 x 10^23 atoms of carbon to grams
Answer
Mass of carbon = 4.069 g
Explanation
Given:
Number of atoms = 2.04x10^23 atoms
Required: Mass of carbon
Solution
Step 1: Find the number of moles of carbon
1 mole = 6.022x10^23 atoms
x moles = 2.04x10^23 atoms
Solve for x
x = (2.04x10^23 atoms x 1 mole)/6.022x10^23 atoms
x = 0.339 mol
Step 2: From the moles, calculate the mass of carbon
m = n x M where m is the mass, n is the moles and M is the molar mass of carbon
m = 0.339 mol x 12,011 g/mol
m = 4.069 g
What is the name for potassium oxide's structure? Give two properties of potassium oxide.
Answer:
- The name for the potassium oxide's structure is ionic.
Properties:
- High melting point.
- Soluble in water.
Explanation:
- The ionic structure it is formed by a cation (atom with positive charge) and an anion (atom with negative charge). In this case, potassium is the cation and the oxigen is the anion.
- Since potassium oxide is an ionic compound, it has a high melting point, because of the strong bonds. Also, it is soluble in polar solvents, like water, because its ions generate polarity in the molecule.
.A voltaic cell consists of a Ni electrode in 1.0M Ni(NO3
)2
and an Fe electrode
in 1.0M Fe(NO3
)2
.
Calculate E°
cell for the spontaneous cell reaction at 25°C
The standard electrode potential value of a cell can be calculated from the reduction potentials of the electrodes. The standard electrode potential E⁰ of the voltaic cell with Ni electrode and iron electrode is 0.19 V.
What is standard electrode potential?The reduction potential of an electrode at standard conditions that is at 298 K and 1 bar pressure is called standard electrode potential.
There are two types of electrodes in a cell called cathode and anode. Cathode is the electrode at which reduction occur where as the electrode which undergo oxidation is called anode.
The standard electrode potential of a cell can be measured as follows.
[tex]E^{0} _{cell} = E^{0} _{cathode} - E^{0} _{anode}[/tex]
Here, the anode is Fe electrode with a standard electrode potential of -0.44 V and the anode is Ni electrode having -0.25 V reduction potential.
Thus the standard electrode potential of the voltaic cell can be calculated as follows:
[tex]E^{0} _{cell} = E^{0} _{Ni^{2+}/Ni} = E^{0} _{Fe/Fe^ {2+}}[/tex]
= (-0.25 v) - (-0.44 v)
= 0.19 V.
Hence, the standard electrode potential of the cell E⁰ containing Ni electrode and Fe electrode is 0.19 V.
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Calculate the molar mass of Na2CO3(in g/mol)
105.987. First we have to find the atomic mass of each atom of the molecule Na = 22.98977, C = 12.011 and O = 15.999. Since we have two atoms of Na the atomic mass of Na need be multiplied by 2, in case of carbon is 1 and 3 for oxigen and add them all together. 2x(22.98977) +1x(12.011) + 3x(15.999) = 105.987
What do these two changes have in common?
sediment settling to the bottom of a muddy puddle
breaking a ceramic plate
Select all that apply.
A
Both are only physical changes.
Both are caused by heating.
Both are chemical changes.
Both are caused by cooling.
The bottom of a muddy puddle breaks a ceramic plate Both are only physical changes. Option A.
Breaking a plate is a physical change because no new products are formed during the event. It cannot be called a chemical change because the chemical composition of the splinter is the same as sheet metal. Any physical change that involves a change of state is reversible. Other state changes include evaporative freezing and condensation. Dissolution is also a reversible physical change.
When water is added to a mixture of sand and salt a solution of dissolved salts is formed leaving the sand intact. This is the physical change in recovering salts and sands from solution by filtration and evaporation. Glass breakage is a physical change because the chemical composition of glass does not change when broken. Furthermore, broken glass can be melted back into its original shape.
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Consider the reaction below Which species is/are) the Bronsnsted-Lowry base(s)?HCO₃⁻ (aq) + F⁻ (aq) = CO₃²⁻ (aq) + HF (aq)A) F-,HFB) HCO3-, F-C) CO32-, HFD) CO32-, F-
Answer
D) CO₃²⁻, F⁻
Explanation
A Brønsted-Lowry acid is a compound that supplies a hydrogen ion in a reaction. A Brønsted-Lowry base, conversely, is a compound that accepts a hydrogen ion in a reaction. Thus, the Brønsted-Lowry definitions of an acid and a base focus on the movement of hydrogen ions in a reaction, rather than on the production of hydrogen ions and hydroxide ions in an aqueous solution.
HCO₃⁻ (aq) + F⁻ (aq) = CO₃²⁻ (aq) + HF (aq)
Therefore, in the reaction above, the species that is/are Bronsnsted-Lowry base(s) are CO₃²⁻ and F⁻
Thus, the correct answer is: D) CO₃²⁻, F⁻
if you have 4.0 moles of nitrogen and 5.0 moles of hydrogen, what is the maximum amount of ammonia that you can produce?
Answer:
Explanation:
Here, we want to get the maximum amount of ammonia that can be produced
From the question, we have it that:
1 mole nitrogen gave 2 moles ammonia
Thus:
4 mole nitrogen will give 8 moles ammonia
Furthermore:
3 moles of hydrogen gave 2 moles of ammonia
5 moles of hydrogen will give:
[tex]\frac{5\times2}{3}\text{ = }\frac{10}{3}[/tex]The maximum amount of ammonia that can be produced is thus 8.0 moles
Conversion factors can be generated based on a balanced chemical reaction. For the
reaction below, identify which conversion factor (equality) is not valid:
C(s) + O2(g) → CO2(g)
A: 1 mole CO₂ = 1 mole C
B: 1 mole CO₂ = 1 mole O2
C: 1 mole C = 1 mole O2
D: 2 moles O₂ = 1 mole CO2
Answer:
D
Explanation:
D. Since CO2 is the only product, all the oxygen has to be converted into the form of CO2.
Let's pretend for a minute that the equation is:
aC + 2O2 -> CO2 where a is a certain number.
There would be no way of balancing this equation because the amount of oxygen on the left would always be twice of that on the right.
Aqueous hydrochloric acid (HCl) reacts with solid sodium hydroxide (NaOH) to produce aqueous sodium chloride (NaCl) and liquid water (H2O). if 1.17 g of sodium chloride is produced from the reaction of 2.6 g of hydrochloric acid and 2.1 g of sodium hydroxide, calculate the percent yield of sodium chloride. Round to 2 sig figs
Taking into account definition of percent yield, the percent yield of sodium chloride is 38.11%.
Reaction stoichiometryIn first place, the balanced reaction is:
HCl + NaOH → NaCl + H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
HCl: 1 moleNaOH: 1 moleNaCl: 1 moleH₂O: 1 moleThe molar mass of the compounds is:
HCl: 36.45 g/moleNaOH: 40 g/moleNaCl: 58.45 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
HCl: 1 mole ×36.45 g/mole= 36.45 gramsNaOH: 1 mole ×40 g/mole= 40 gramsNaCl: 1 mole ×58.45 g/mole= 58.45 gramsH₂O: 1 mole ×18 g/mole= 18 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the maximum amount of product in the reaction.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 36.45 grams of HCl reacts with 40 grams of NaOH, 2.6 grams of HCl reacts with how much mass of NaOH?
mass of NaOH= (2.6 grams of HCl× 40 grams of NaOH)÷ 36.45 grams of HCl
mass of NaOH= 2.85 grams
But 2.85 grams of NaOH are not available, 2.1 grams are available. Since you have less mass than you need to react with 2.6 grams of HCl, NaOH will be the limiting reagent.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theoretical yield)×100%
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product.
Theoretical yield of NaClConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 40 grams of NaOH form 58.45 grams of NaCl, 2.1 grams of NaOH form how much mass of NaCl?
mass of NaOH= (2.1 grams of NaOH× 58.45 grams of NaCl)÷ 40 grams of NaOH
mass of NaOH= 3.07 grams
Then, the theoretical yield of NaCl is 3.07 grams.
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 1.17 gramstheorical yield= 3.07 gramsReplacing in the definition of percent yields:
percent yield= (1.17 grams÷ 3.07 grams)×100%
Solving:
percent yield= 38.11%
Finally, the percent yield for the reaction is 38.11%.
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Determine whether the bond between each of the following pairs of atoms is purely covalent, polar covalent, or ionic.
- I and Cl
-C and O
- Ca and F
- P and P
The kind of bonds that can be formed between each of the atoms is;
I and Cl - ionic bondC and O - polar covalent bond Ca and F - ionic bond P and P - covalent bondWhat is the Ionic bond?The ionic bond is the kind of bond that is formed between two atoms in a compound when there is a complete transfer of electrons between the atoms in the compound.
A covalent bond is said to be formed between two atoms when there is a sharing of the electrons that can be found between two atoms. We know that a bond is ionic when the difference in the electronegativity of the atoms is high.
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What ions are present in Fe(NO3)3 (aq) solutions?
Explanation:
Iron (III) nitrate is a soluble salt. When dissolved in water it will dissociate into its ions: Iron (III) and nitrate.
Fe(NO₃)₃ (aq) ----> Fe³⁺ (aq) + 3 NO₃⁻ (aq)
Answer: Fe³⁺ and NO₃⁻.
Of the molecules SiCl4 and SiI4 , which has bonds that are more polar?
The SiCl4 molecules' bonds will be more polar.
In a molecule, the difference in electronegativity between the atoms engaged in a bond determines its polarity. Iodine is not as electronegative as chlorine. As a result, the electrons in the Si-Cl bond will be localized more close to the Cl, giving the bond its polarity. Iodine is less electronegative than chlorine, hence it won't produce a Si-I bond that is highly polarized.
Tetrachlorosilane, often known as silicon tetrachloride, is an inorganic chemical having the formula SiCl4. It is an air-fuming, colorless volatile liquid. High purity silicon and silica are made using it for industrial applications.
The chemical compound with the formula SiI4 is called silicon tetraiodide. It is a tetrahedral molecule with 2.432 Si-I bonds. The silicon amides with the formula Si(NR2)4 are precursors to SiI4. Additionally, it has attracted attention in the production and etching of silicon for microelectronics.
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Calculate the volume of an object with dimensions measuring: 12 cm x 3 cm x 9 cm?
Answer: 324 cm³
Explanation: Volume is calculated by the formula LxWxH (length times width times height). In your problem, it would just me 12x3x9. After that, just add units. :)
How many valence electrons are in the outermost shell of all noble gases except helium?
Answer:
8
Explanation:
All noble gases have 8 electrons in their outermost shell and are in an octet state.
Which of the following are SI units? Select all that apply.gLs
INFORMATION:
We have the following options
g
L
s
And we must select the options that are SI units.
STEP BY STEP EXPLANATION:
The SI units are:
- For mass: Kg
- For volume: cm^3
- For time: s
- For length: m
Finally, we can see that from given options, s is the unique that belongs to the SI units.
ANSWER:
s
i need help on question 2For each of the reactions below, write the (i)equilibrium constant expression, (ii) find its value,and (iii) determine if it’s reactant-favored, product-favored, or neither.(a) N 2 (g) + 3 H 2 (g) -----> 2 NH 3 (g)[N 2 ]eq = 1.50 M [H 2 ]eq = 2.00 M[NH 3 ]eq = 0.01 M(b)HF(aq) -----> H + (aq) + F – (aq)[HF] eq = 0.55 M [H + ] eq = 0.001 M[F – ] eq = 0.001 M(c) Fe 3+ (aq) + SCN – (aq) -----> FeSCN 2+ (aq)[Fe 3+ ] eq = 0.55 M [SCN – ] eq = 0.001M[FeSCN 2+ ] eq = 0.001 M
Answer
Explanation
Part A
Given:
a) N₂ (g) + 3H₂ (g) -----> 2NH₃ (g)
[N₂ ]eq = 1.50 M, [H₂ ]eq = 2.00 M, [NH 3 ]eq = 0.01 M
Solution:
i. The equilibrium constant expression for the reaction is
[tex]Kc=\frac{[NH_3]^2}{[N_2][H_2]^3}[/tex]When radium-226 experiences alpha decay, the relative mass of the particle released in amu is
Energy of a photon is equal to 4.655 (4.44 + 0.08).
=0.135MeV=135KeV
Nature contains the radioactive element Ra-226. In 1898, Pierre and Marie Curie were working with uranium ore when they made the discovery of radium.
Uranium-238 undergoes radioactive decay, resulting in Ra-226.
A light paint was also created by combining radium-226 with fluorescent zinc sulfide. During and after World War I, this luminescent paint was employed to decorate watches, compasses, and other equipment.
High radium levels can result in cancer (particularly bone cancer), anemia, a blood issue, shattered teeth and cavities, and cataracts, growths in the eyes.
Some of these medical issues take years to manifest. The majority are brought on by gamma radiation, which can spread widely through the atmosphere.
The mineral uraninite contains the highest concentrations of radium 226 in nature, while it can be found in different proportions in almost all types of rocks and soils that contain naturally occurring uranium.
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Density
Which of the following do you think is more dense?
Water
Ping Pong Ball
Which is more dense a drop of water or ping pong ball
A drop of water is denser than a ping-pong ball.
Usually, water is made of particles that are firmly pressed together. In differentiation, plastic (the material ping pong balls are made of) may be a lightweight fabric and the particles are not as firmly stuffed together.
The thickness of a ping pong ball is 0.0840 g/cm³, though water’s thickness is 997 kg/m³. Subsequently, ping pong balls aren’t about as thick as water and will continuously coast and surface greatly quickly.
The ping pong ball appears to oppose gravity and coast within the air.
Ping-pong balls drift within the water since they are amazingly lightweight, empty, and filled with air. Too, the water’s surface pressure makes it simple for the ping pong ball to drift.
In expansion, water is denser than ping pong balls, making them look for the most noteworthy point of water.
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8) 0.450 moles of NaCl are dissolved in 145.0 mL of water. Calculate the molarity of the NaCl solution.
Molarity is a way of expressing the concentration of a solute in a solution, it is expressed with the term M and can be described by the following equation:
[tex]Molarity=\frac{MolesSolute}{Lsolution}[/tex]Moles of solute = 0.450 mol
Lsolution= Liters of water+Liters of NaCl
We will assume in this case that the volume of NaCl is negligible compared to the volume of water. Therefore, the volume of the solution will be 145.0 mL or 0.1450L
We replace the known data:
[tex]Molarity=\frac{0.450mol}{0.1450L}=3.1M[/tex]Answer: The molarity of the NaCl solution is 3.1M
A 0.400M formic acid (HCOOH) solution freezes at −0.758∘C Calculate the Ka of the acid at that temperature. (Hint: Assume that molarity is equal to molality. Carry out your calculations to three significant figures and round off to two for Ka.)
First, find the molality of the solution.
[tex]i=\frac{T_f}{k_f\cdot m}[/tex]Where k is the molal freezing point, which is 1.86 C/m for water.
[tex]i=\frac{0.758}{1.86\cdot0.4}=\frac{0.758}{0.744}=1.02[/tex]The equilibrium constant Ka would be
[tex]K_a=\frac{\lbrack HCOO\rbrack\lbrack H\rbrack}{\lbrack HCOOH\rbrack}[/tex][tex]K_a=\frac{x\cdot x}{0.4-x}[/tex]Then, to find x.
[tex]\begin{gathered} i=\frac{0.4-x+x+x}{0.4}=1.02 \\ x=1.02\cdot0.4-0.4=0.008 \end{gathered}[/tex]Once we have x, we can obtain the constant Ka
[tex]K_a=\frac{(0.008)^2}{0.4-0.008}=\frac{6.4\times10^{-5}}{0.392}=1.6\times10^{-4}[/tex]Therefore, the constant Ka of the reaction is 1.6x10^-4.
Where is visible light located on the EM spectrum?A. Right in the middleB. It isn’t on the EM spectrumC. All the way to the rightD. All the way to the left
explanation - Visible light sits in the region with ultraviolet (UV) to the left of the spectrum.
see picture below :
• The picture shows exactly where the visible light is located in the electromagnetic spectrum .
• That is to the left of the ultraviolet radiation, and to the right of infrared (IR).