Answers
Al
Al
in grams and you are asked to find the mass of
Al
2
O
3
Al
2
O
3
in grams. For questions such as this, the strategy is to convert from grams of
Al
Al
to moles of
Al
Al
, then to moles of
Al
2
O
3
Al
2
O
3
, and finally to grams of
Al
2
O
3
Al
2
O
3
.
grams Al⟶moles Al⟶moles
Al
2
O
3
⟶grams
Al
2
O
3
grams
Al
⟶
moles
Al
⟶
moles
Al
2
O
3
⟶
grams
Al
2
O
3
To convert grams of
Al
Al
to moles of
Al
Al
, you use the molar mass of
Al
Al
,
26.98 g/mol
26.98
g/mol
. The balanced chemical equation is used to relate the moles of
Al
Al
to the moles of
Al
2
O
3
Al
2
O
3
. There are 2 moles of
Al
2
O
3
Al
2
O
3
formed for every 4 moles of
Al
Al
that react. To convert moles of
Al
2
O
3
Al
2
O
3
to grams of
Al
2
O
3
Al
2
O
3
, you use the molar mass of
Al
2
O
3
Al
2
O
3
,
101.96 g/mol
101.96
g/mol
. This can be done one conversion at a time, or you can string the conversions together.
30.6 g Al×
1 mole Al
26.98 g Al
×
2 moles
Al
2
O
3
4 moles Al
×
101.96 g
Al
2
O
3
1 mole
Al
2
O
3
=57.8 g
Al
2
O
3
Hopefully the picture will show up this time.
Related Questions
The planet Jupiter is composed mostly of hydrogen gas.To what temperature, in ºc, must a 20.2 g sample of hydrogen gas be heated to, at 140 kPa, tooccupy a volume of 224 L?
Answers
We are asked to find the temperature of hydrogen gas (H2) given certain pressure and temperature conditions. Since the pressure to which the gas will be subjected is low we can apply the ideal gas law which is represented by the following equation:
[tex]PV=nRT[/tex]Where,
P= Pressure = 140kPa = 1.38169 atm
V= Volumen = 224 L
R= Ideal gas constant = 0.08206 (atm L)/(mol K)
n= Number of moles
T= Temperature in K
Now we are going to find the number of moles of the gas, n. We will use the molar mass of the hydrogen gas (2.01594g/mol). So, we have:
[tex]n=\text{ }\frac{\text{Mass}}{Molar\text{ mass}}=\frac{20.2\text{ g}}{2.01594\text{ g/mol}}=10.02\text{ mol}[/tex]Now, we will clear the temperature T from the first equation:
[tex]T=\frac{PV}{nR}[/tex]We replace the known values:
[tex]\begin{gathered} T=\frac{1.38169atm\times224L}{10.02mol\times0.08206\frac{atm.L}{mol.K}} \\ T=376.40K \end{gathered}[/tex]So, the temperature of hydrogen gas will be 376.40K
Need help on how to create balanced equations17.1 g of magnesium metal burns in sulphur dioxide to for magnesium oxide and sulphur. Create a balanced equation for the reaction
Answers
For a chemical equation to be balanced, the total moles at the reactant must be equal to that of the product. According to the given question, the reactants are magnesium and sulphur dioxide.
• Magnesium = Mg
,• sulphur dioxide = SO₂
If they form magnesium oxide (MgO) and sulphur (S), these will be the product. The balanced chemical reaction is shown below:
[tex]2Mg+SO_2\rightarrow2MgO+S[/tex]This gives the balanced equation for the reaction
what is the phase triangle in chemistry
Answers
A ternary phase diagram shows the phases of a ternary system. These phases are usually represented by triangular diagrams. The vertices of the triangle represent the three pure components, and the distance from the vertices is a measure of their cardinality.
A phase diagram is a graphical representation of the different stages of a substance or mixture of substances that coexist in thermodynamic equilibrium and undergo phase changes under different operating conditions such as temperature pressure and volume.
The diagram is divided into three regions representing the solid-liquid and gaseous states of matter. The best way to remember the regions that correspond to each of these states is to remember the temperature and pressure conditions most relevant to solids liquids and gases. A phase diagram shows the temperatures and pressures at which different phases of matter solids liquids and gases can exist.
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PLEASE HELP!! What is the WEIGHTED average atomic mass of this element?
An isotope with mass 185 amu is 19% abundant
An isotope with mass 180 amu is 81% abundant
Answers
Hello. This is Mr. Biederman, your science teacher at Insight School of Michigan. You are obviously one of my students. Posting content here is against school policy. Just ask me directly for help. I am always happy to help with anything!
The synthesis of sodium chloride according to the reaction: ___ Na + ___ Cl2 → ___ NaCl.a. What volume of chlorine gas at STP is necessary for the complete reaction of 4.85 grams of sodium metal.
Answers
Answer:
[tex]2.36\text{ L }[/tex]Explanation:
Here, we want to know the volume of chlorine gas necessary to complete the reaction
We can start by writing a balanced equation of reaction as follows:
[tex]2Na\text{ + Cl}_2\text{ }\rightarrow2NaCl[/tex]From the balanced equation, we can see that 1 mole of chlorine gas requires 2 moles of sodium metal
Now, let us get the number of moles of sodium metal that actually reacted
We have that as the mass of sodium metal divided by the atomic mass
The atomic mass of sodium metal is 23 amu
Thus, we have the number of moles as:
[tex]\frac{4.85}{23}\text{ = 0.211 mole}[/tex]Since the mole ratio is 2 to 1, half of this number of moles is needed by the chlorine gas
Mathematically, 1 mole of a gas occupies a volume of 22.4 L at STP
the volume occupied by the calculated number of moles will be:
[tex]\frac{0.211}{2}\times\text{ 22.4 = 2.36 L }[/tex]Draw a flow sheet to show how you would separate the components of a mixture containing an acid substance, toluic acid, a basic substance, p-bromo-aniline, and anthracene, a neutral substance.
Answers
In order to separate the mixture of toluic acid, p-bromo-aniline, and anthracene, the difference in their physical properties such as solubility in organic or inorganic solvents is utilized.
The flow chart for the separation method is found in the attachment.
What are mixtures?Mixtures are substances that consist of two or more substances that are physically combined together.
The physical properties of the components of the mixture are employed in the separation of the constituents of the mixture
In separating the given mixture, it is first dissolved in dichloromethane, and then dilute NaOH is added to separate the toluic acid in the aqueous phase. The toluic acid is then precipitated by adding HCl.
Dilute HCl is then added to the organic phase to separate p-bromo-aniline into an aqueous phase and then precipitated by adding 10% NaOH.
Anthracene is left in the organic phase.
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How many moles of water will be produced if 3.50 moles of hydrogen react completely?___H2(g) + ___O2(g) ___H2O (l)
Answers
ANSWER
Moles of water is 3.50 moles
EXPLANATION
Given that:
The mole of hydrogen gas is 3.50 moles
Firstly, write a balanced equation for the reaction
[tex]\text{ 2H}_{2(g)}+\text{ O}_{2(g)}\rightarrow\text{ 2H}_{2_}O[/tex]In the reaction, 2 moles of hydrogen will give you 2 moles of H2O
Since the number of moles of hydrogen given id 3.5 moles, then the number of moles of water.
Chemistry help please asap
Answers
No. of atoms in 39.1g of P is 7.59× 10²³ atoms. No. of atoms in 8.97g of Bi is 2.58 × 10²² atoms
1. Given,
we have to find number of atoms in 8.97g of Bi
Now,
Molecular weight of Bi = 209g
Hence,
1 mole of Bi = 209g
209 g of Bi = 6.022 × 10²³ atoms
Hence,
8.97 g of Bi = 6.022 × 10²³ × 8.97 / 209 atoms
Number of atoms in 8.97g of Bi = 2.58 × 10²² atoms
2. we have to find number of atoms in 39.1g of P
Now,
Molecular weight of P = 31g
Hence,
1 mole of P = 31g
31 g of P= 6.022 × 10²³ atoms
Hence,
39.1 g of P = 6.022 × 10²³ × 39.1/31 atoms
No. of atoms in 39.1g of P = 7.59× 10²³ atoms
Thus, from the above conclusion we can say that , No. of atoms in 39.1g of P is 7.59× 10²³ atoms.
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Two different samples, A and B, of zinc oxide were obtained from different sources. When heated in a stream of hydrogen, they were reduced to yield the following results: sample A mass of sample 10.0g mass of zinc residue 8.11g sample B mass of sample 13.2g mass of zinc residue 10.70g. Show that the figures illustrate the law of constant composition
Answers
-ZnO is the compound illustrated by the law of constant composition.
According to the rule of constant proportion, the elements are always present in certain amounts to one another by mass in chemical compounds. For instance, regardless of how or where water is obtained, it always contains H2O, hydrogen, and oxygen in a mass ratio of 1:8, according to an example.
for sample A
mass Zn = 8.11g
mass of O =10-8.11=1.89g
Zn= 8.11/65 = 0.1
O= 1.89/16 =0.1
ratio is 1:1
compound = ZnO
for sample b
Zn= 10.70g
O= 13.2-10.7=2.5g
Zn= 10.70/65 =1
O= 2.5/16 =0.16=1
ratio = 1:1
compound= -ZnO
Therefore, it is shown that the figures illustrate the law of constant composition.
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H-C=C-H. How many pairs of shared electrons between two carbon atoms and _________ pairs of shared electrons between the carbon and hydrogen atoms
Answers
In acetylene (H-C=C-H) three pairs of electrons are shared between two atoms of carbon forming a triple bond, while a single pair of electrons is shared between a carbon atom and a hydrogen atom.
What is electron?With a negative one elementary charge electric charge, the electron is a subatomic particle. Given that they have no known components or substructure and are a member of the first generation of lepton particles, electrons are typically regarded as elementary particles.
Approximately 1/1836th of a proton's mass is that of an electron. An intrinsic half-integer value angular momentum (spin) with units of the reduced Planck constant,, is one of the electron's quantum mechanical properties.
The Pauli exclusion principle states that since electrons are fermions, they can never share the same quantum state. Electrons, like all elementary particles, have the ability to interact with other particles and behave like waves when they are diffracted, similar to how light does.
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balance the following chemical reaction equation: ___PH3 + ___O2 --> ___P4O10 + ____H2O
Answers
Answer:
4 PH₃ + 8 O₂ -----> P₄O₁₀ + 6 H₂O
Explanation:
An equation is balanced when there is an equal amount of each element on both sides of a chemical reaction. Remember, the reactants are the molecules that lie on the left of the reaction arrow and the products are the molecules that lie on the right.
The unbalanced equation:
PH₃ + O₂ -----> P₄O₁₀ + H₂O
Reactants: 1 phosphorus, 3 hydrogen, 2 oxygen
Products: 4 phosphorus, 2 hydrogen, 11 oxygen
As you can see, there is an unequal amount of each element. To balance the equation, we can add coefficients to change the quantity of particular molecules. By doing this, you subsequently change the amount of the elements.
The balanced equation:
4 PH₃ + 8 O₂ -----> P₄O₁₀ + 6 H₂O
Reactants: 4 phosphorus, 12 hydrogen, 16 oxygen
Products: 4 phosphorus, 12 hydrogen, 16 oxygen
****P₄O₁₀ technically has a coefficient of 1
2. Using the periodic table above, which of the following molecules have a *
stable configuration that satisfies the octet rule for all atoms? (1 pt)
MgBr
MgO
SiO
KCI2
Answers
Using the periodic table, THE molecule that has a stable configuration that satisfies the octet rule for all atoms is option B: MgO
Does MgO obey octet rule?MgO (Magnesium Oxide) and (Magnesium Oxide) establish an ionic bond thanks to the electrostatic attraction that develops between them. A MgO molecule contains two atoms with stable octet arrangements.
Note that when we study the octet rule of the MGO Lewis structure. The octet rule is satisfied by the oxygen atoms and magnesium in the MgO Lewis structure. Since oxygen only requires two electrons, the condition transfers two electrons. Oxygen receives these two electrons from magnesium, a metal having two electrons in its valence shell.
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A researcher studying the nutritional value of a new candy places a 6.00 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.42 ∘C. If the heat capacity of the calorimeter is 30.70 kJ⋅K−1, how many nutritional Calories are there per gram of the candy?
Answers
We obtain the nutritional calories as 2967 cal/g.
What is the nutritional Calories are there per gram of the candy?Now we know that heat is evolved when we combust a compound or a substance inside the bomb calorimeter. Given that we have the following information about the system;
Temperature rise = 2.42 ∘C
Heat capacity = 30.70 kJ⋅K−1
The we have the energy as obtained from;
H = 30.70 kJ⋅K−1 * 2.42 ∘C = 74.29 kJ or 17.8 * 10^3 cal
Now we are required in this question as we have it to obtain the heat capacity per gram as; 17.8 * 10^3 cal/6g = 2967 cal/g
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A farmer intercropped maize, sorghum, and millet in the same field.
What advantage would probably ensue?
Responses
A.) The three crops would provide a channel to slow down runoff.
B.) The farmer would make higher prices at the market.
C.) The farmer would learn about two new crops with strong potential.
D.) The field would be protected against the possibility of total crop loss.
Answers
Answer:
D because...........that is the answer
Explanation:
your welcome
before European colonization, how did indigenous people protect themselves from catastrophic wilfires?
Answers
Before Europe colonized the Americas indigenous peoples used controlled burning to alter the landscape. Controlled fires were part of the environmental cycles and wildlife habitat protection that underpinned the cultures and economies of the Native American peoples.
Before European invasion tribes used controlled burning to remove shrubs that acted as craters returning nutrients to the soil preventing overcrowding and excessive competition for nutrients and water and maintaining healthy forests pastures. and cleared grasslands for wildlife such as water buffalo Prevent forest fires.
For many indigenous peoples fire was an essential part of life. Native Americans Alaskan Natives and Native Hawaiians used fire to clear land for crops and travel to cultivate land for certain plant and animal species to hunt game and for many other important purposes. used. Indigenous peoples were able to survive many natural disasters because they learned to move quickly when a disaster struck an area.
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Thorium emits a beta particle is it a chemichal or nuclear reaction
Answers
Answer:
It is a nuclear reaction as Thorium here undergoes beta decay which is nuclear reaction
Explanation:
Beta decay occurs when an unstable nucleus emits a beta particle and energy. A beta particle is either an electron or a positron. Positron can be considered as an anti-electron as it has a positive charge unlike electrons. When the beta particle is an electron, the decay is called beta-minus decay. When the beta particle is a positron, the decay is called beta-plus decay. Beta-minus decay occurs when a nucleus has too many neutrons relative to protons, and beta-plus decay occurs when a nucleus has too few neutrons relative to protons. Thorium undergoes beta minus decay and produces Actinium and an electron.
calculate the number of moles in 1.0 × 10^21 atoms
Answers
Answer:
0.0017 mole
Explanation:
1 mole = 6.02 x 10^23 atoms
so the number of mole in 1.0 × 10^21 atoms is
(1.0 × 10^21)/(6.02 x 10^23) = 0.00166112956 or 0.0017 mole
PLEASE HELP ASAP.
What conditions are being experienced
by an observer in Florida when the moon
is at Position 2?
Answers
Answer:
the conditions are that when the moon is at point 2 is that the moon is covering Florida so that means that part of the earth is dark whilst others is light
Explanation:
What is the mass of this piece of porcelain in oz?Show all work/use conversions/metric prefixes. I
Answers
The mass of the piece of porcelain is 27.3 oz.
1st) It is necessary to calculate the mass of the porcelain with the density formula:
[tex]\begin{gathered} \text{density}=\frac{mass}{\text{volume}} \\ 2.40g\mathrm{}mL^{-1}=\frac{mass}{325mL} \\ 2.40g.mL^{-1}\cdot325mL=\text{mass} \\ 780g=\text{mass} \end{gathered}[/tex]2nd) Now it is necessary to convert the gram unit to oz. Here we need to use the relation that 1 g is equal to 0.035 oz:
[tex]780g\text{.}\frac{0.035oz}{1g}=27.3oz[/tex]So, the mass of the piece of porcelain is 27.3 oz.
Hi my teacher gave me this and i have absolutely no idea how to complete this please helpNumber 1
Answers
Answer
V₂ = 1.9 L
Explanation
Given:
P₁ = 1.5 atm
V₁ = 3.0 L
T₁ = 20⁰C = (20 + 273 )K = 293 K
P₂ = 2.5 atm
T₂ = 30⁰C = (30 + 273 )K = 303 K
What to find:
V₂
Step-by-step solution:
The unknown V₂ can be determined using the combined gas equation, which is given below.
[tex]\begin{gathered} \frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} \\ \\ \Rightarrow V_2=\frac{P_1V_1T_2}{T_1P_2} \end{gathered}[/tex]Putting the values of the given parameters into the equation, we have
[tex]V_2=\frac{1.5atm\times3.0L\times303K}{293K\times2.5atm}=\frac{1363.5\text{ }L}{732.5}=1.9\text{ }L[/tex]Therefore, the unknown V₂ in number 1 is 1.9 L
The correct ionization equation for a weak acid is ?
HA + H2O ⇌ A + H3O+
A + H2O --> HA + H3O+
HA + H3O+ ⇌ A + H2O
HA + H2O --> A + H3O+
Answers
The correct ionization equation for a weak acid is as follows: HA + H₂O ⇌ A + H₃O⁺ (option A).
What is a weak acid?A weak acid is an acid that partially dissociates into its ions in an aqueous solution or water. In contrast, a strong acid completely dissociates into its ions in water.
The conjugate base formed when a a weak acid dissociates is a weak base. Examples of weak acids are as follows:
Ethanoic acidformic acid (HCOOH)hydrocyanic acid (HCN)hydrofluoric acid (HF)hydrogen sulfidetrichloracetic acidThe reaction arrow for a weak acid ionizing in water is a double arrow, indicating that both the forward and reverse reactions occur at equilibrium.
Therefore, HA + H₂O ⇌ A + H₃O⁺ is the ionization reaction that represents a weak acid.
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Hydrogen (H-1), deuterium (H-2), and tritium (H-3) are the three isotopes of hydrogen. What are the values of a,b, and c in the table?
Answers
Hydrogen (H-1), (H-2), and (H-3) are the three isotope of hydrogen. the values of a,b, and c in the table are: a=1 , b=1, c=2.
no. of proton no. of electron no. of neutron
H-1 1 1 0
H-2 a= 1 1 b= 1
H-2 1 1 c= 2
Isotope can be defined as the element having same no. of protons but different no. of neutrons. we can also defined as elements having same atomic number but different mass no. Hydrogen (H-1), (H-2), and (H-3) are the three isotopes of hydrogen. ¹H has only 1 proton and zero neutron having ,mass number 1. ²H has one proton and one neutron having mass no. 2. ³H has one proton and two neutron and having mass number 3.
Thus, Hydrogen (H-1), (H-2), and (H-3) are the three isotope of hydrogen. the values of a,b,and c in the table are: a=1,b=1,c=2.
no. of proton no. of electron no. of neutron
H-1 1 1 0
H-2 a = 1 1 b = 1
H-2 1 1 c = 2
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The first-order rate constant for the decomposition of N2O5,
2N2O5(g)→4NO2(g)+O2(g)
at 70∘C is 6.82×10−3 s−1. Suppose we start with 2.50×10−2 mol of N2O5(g) in a volume of 1.6 L What is the half-life of N2O5 at 70 ∘C ?
Answers
The half-life of N₂O₅ at 70°C then it is 50s or 0.8min
Half life is the the interval of time required for one half of the atomic nuclei of a radioactive sample to decay
The first-order rate constant for the decomposition of N₂O₅ and reaction is
2N₂O₅(g) → 4NO₂(g)+O₂(g)
The half life is the time at which the concentration of N₂O₅ is the half initial concentration that is [ N₂O₅ ] = 1/2 [ N₂O₅ ]₀
Using this same equation then
ln ([N₂O₅]) = -2kt + ln ([N₂O₅]₀)
We replace [ N₂O₅ ] by 1/2[ N₂O₅ ]₀ and solve for t
ln (1/2 [N₂O₅]₀) = -2kt + ln ([N₂O₅]₀) applying logarithmic property
ln 1/2 + ln([N₂O₅]₀) = -2kt + ln ([N₂O₅]₀) solving for t and applying logarithmic property (ln 1/2 = ln 1 - ln 2 = 0 - ln 2 = - ln 2)
t = ln 2/2k
t = 50s or 0.8min
The half-life of N₂O₅ at 70°C then it is 50s or 0.8min
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What is the volume of 58.9 grams of oxygen gas (O2) at STP?
Answers
Answer
41.2 L
Explanation
Given that:
The mass of oxygen gas (O₂) = 58.9 grams
What to find:
The volume of 58.9 grams of oxygen gas (O₂) at STP.
Step-by-step solution:
The first step is to convert 58.9 grams of oxygen gas (O₂) given to moles using the mole formula:
[tex]Moles=\frac{Mass}{Molar\text{ }mass}[/tex]The molar mass of oxygen gas (O₂) is 31.998 g/mol.
[tex]Moles\text{ }of\text{ }O_2=\frac{58.9g}{31.998g\text{/}mol}=1.8407\text{ }mol[/tex]The final step is to convert the 1.8407 moles of oxygen gas (O₂) to volume using the conversion factor below.
Conversion factor: The molar volume of any gas at STP is 22.4 L. That is, one mole of any gas has a volume of 22.4 L or 22,400 mL.
So,
[tex]\begin{gathered} 1\text{ }mol\text{ }O_2=22.4\text{ }L \\ \\ 1.8407\text{ }mol\text{ }O_2=x \\ \\ x=\frac{1.8407\text{ }mol}{1\text{ }mol}\times22.4\text{ }L \\ \\ x=41.2\text{ }L \end{gathered}[/tex]The Lewis dot model of a molecule is shown.
H
c=o
H
Based on the model, which of the following is true? (5 points)
O a
Ob
Oc
d
Oxygen is the least electronegative of the three atoms.
Carbon has a total of four bonded pairs of electrons around it.
Oxygen has four pairs of non-bonding Innermost shell electrons.
Carbon has an incomplete octet as it transfers an electron to each hydrogen.
Time left for this
Answers
The Lewis dot model of a molecule is shown as -
H \ C = : O : / HOn the basis of this model, the statement which is true is Carbon has a total of four bonded pairs of electrons around it.
Formaldehyde, HCHO has two hydrogen atoms, one carbon atom and one oxygen atom. Oxygen and carbon has double bond between them. Carbon atom is located at the center in the lewis dot structure. Valence electrons in the outer shell of carbon is four. Four electrons of carbon are bonded as it is bonded with two hydrogen atoms and one oxygen atom and oxygen and carbon atom has double bond between them.
Therefore, Carbon has total of four bonded pairs of electrons around it. Hence, this statement is true.
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The mass of acetic acid in a 2.00 mL sample of vinegar (density of the vinegar is 0.996 g/mL) is determined to be 0.101 g. What is the mass % of acetic acid in the vinegar using 1 decimal place in your final answer?
Answers
The percentage of mass of 0.101g in 2.093g of vinegar comes out to be 4.8%. Mass percentage does not have any unit as numerator and denominator contains the same unit.
What is percentage by mass?Mass percentage represents the the percentage of each element that is making a particular compound.
mass of vinegar solution =density of vinegar solution× volume of vinegar solution
=0.996 g/mL×2.00 mL
=1.992g
Percentage of mass=(mass of acetic acid ÷ total mass of solution) x 100%
=[0.101÷(0.101+1.992)]×100
=0.048×100
=4.8%
Thus the mass percentage of acetic acid is 4.8%
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The Lewis dot model of a molecule is shown.
H
c=o
H
Based on the model, which of the following is true? (5 points)
O a
Ob
Oc
d
Oxygen is the least electronegative of the three atoms.
Carbon has a total of four bonded pairs of electrons around it.
Oxygen has four pairs of non-bonding Innermost shell electrons.
Carbon has an incomplete octet as it transfers an electron to each hydrogen.
Time left for this
Answers
Answer:
b.Carbon has a total of four bonded pairs of electrons around it.
Investigating Energy Systems
Posible Subclaims:
The Hand-Crank Generator System does have energy.
or
The Hand-Crank Generator System does not have energy.
Evidence
(observations about whether the system does or does not have energy)
This matters because . . .
(How does this evidence support the subclaim?)
Therefore, . . .
(subclaim)
Answers
Answer:
Investigating Energy Systems
Posible Subclaims:
The Hand-Crank Generator System does have energy.
or
The Hand-Crank Generator System does not have energy.
Evidence
After an afternoon party, a small cooler full of ice is dumped onto the hot ground and melts. If the cooler contained 9.10 kg of ice and the temperature of the ground was 42.0 °C, calculate the energy that is required to melt all the ice at 0 °C. The heat of fusion for water is 80.0 cal/g
Answers
The heat energy that is required to melt all the ice at temperature of 0° C is 7.28x10^5 cal.
What is heat energy?
Heat energy is created by the movement of tiny atoms, molecules, or ions in solids, liquids, and gases. It is possible to transfer heat energy from one thing to another. Heat is a flow or transfer that happens when two objects have different temperatures from one another.
We know that the initial temperature of the ice (T) is 0° C
Latent heat of ice is given in the question as 80.0 cal/g
The mass of ice given in question is 9.10 kg
So, the heat required to change the phase of the ice is given as:
[tex]Q=mL[/tex]
[tex]Q =(9.10 \times 10^3)(80)[/tex]
[tex]Q = 728 \times 10^3[/tex]
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A major component of gasoline is octane C8H18. When liquid octane is burned in air it reacts with oxygen O2 gas to produce carbon dioxide gas and water vapor. Calculate the moles of carbon dioxide produced by the reaction of 0.900mol of octane. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.
Answers
When 0.900mol of octane is burned in air it reacts with oxygen Oxygen gas to produce carbon dioxide gas and water vapor, then 7.20mole of carbon dioxide is produced.
What is combustion reaction?
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water.
The balanced reaction is
[tex]2C_{8} H_{18}+25O_{2} \rightarrow16CO_{2} +18H_{2}O[/tex]
The mole ratio of octane to carbon dioxide is 2:16 that is 1:8
2 mole of octane produce =16 mole of carbon dioxide
1 mole of octane produce = 8 mole of carbon dioxide
0.900mol of octane produce= 8× 0.900
= 7.20mole
Thus the mole of carbon dioxide produced is 7.20mole.
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