The answer is: the mass of carbon is 420.6 grams.
m(C₈H₁₈) = 500 g; mass of octane.
M(C₈H₁₈) = 114.22 g/mol; molar mass of octane.
n(C₈H₁₈) = m(C₈H₁₈) ÷ M(C₈H₁₈).
n(C₈H₁₈) = 500 g ÷ 114.22 g/mol.
n(C₈H₁₈) = 4.38 mol; amount of octane.
In one molecule of octane, there are eight carbon atoms:
n(C) = 8 · n(C₈H₁₈).
n(C) = 8 · 4.38 mol.
n(C) = 35.02 mol; amount of carbon.
m(C) = 35.02 mol · 12.01 g/mol.
m(C) = 420.6 g; mass of carbone.
Answer:
at the top of the swing
at the top of the swing
at the bottom of the swing
at the bottom of the swing
Explanation:
Answers:
Fission breaks apart nuclei
Fusion puts them together.
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Explanation:
The term "fission" is related to the term "fissure" which means "a cut or divide", often describing a geologic feature of the earth (eg: a crack in the rock).
Fusion is the idea of putting things together, which is the opposite of fission. The term doesn't have to apply to nuclear fusion. It could be something like the fusing of two ideas to create one new idea.
Here we have to get the right answers which include the given phrase.
The correct answers are as following:
High boiling and melting points: Hydrogen bond increase the amount of energy required for phase changes to occur, thereby raising the boiling and melting points.
High specific heat: Hydrogen bond increase the amount of energy required for molecules to increase the speed, thereby raising the specific heat.
High surface tension: Hydrogen bonds produce strong inter molecular attractions, which increase surface tension.
The incorrect answer:
Lower density as a solid than as a liquid: actually, density of solid is more than density of liquid as hydrogen bonds in solid produce strong inter molecular attractions among molecules, which aggregates molecules together, hence volume of associated molecules reduces. Therefore, density of solid is more than that of liquid.
Answer:
Explanation:
1. Calculate the mass of each reactant gas in the mixture
<u>a) CH₄</u>
- 28.6% of 289g
- 0.286 × 289g = 82.654g
<u>b) C₃H₈</u>
- 71.4% of 289g
- 0.714 289g = 206.346g
2. Calculate the mass of CO₂ produced by each gas in the mixture
<u>a) CH₄</u>
i) Balanced chemical equation:
- CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
ii) Number of moles of CH₄:
- number of moles = mass in grams / molar mass
- molar mass of CH₄ = 16.04g/mol
- number of moles = 82.654g / 16.04 g/mol = 5.153 mol
iii) Number of moles of CO₂
- From the balanced chemical equation, the mole ratio is 1 mol CH₄ : 1 mol CO₂.
- Hence, 5.153 mol of CO₂ are produced
iv) Convert the number of moles to mass
- mass = number of moles × molar mass
- molar mass of CO₂ = 44.01g/mol
- mass = 5.153 mol × 44.01g/mol = 226.8 g
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<u>b) C₃H₈</u>
i) Balanced chemical equation:
- C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(g)
ii) Number of moles of C₃H₈:
- number of moles = mass in grams / molar mass
- molar mass of C₃H₈ = 44.1g/mol
- number of moles = 206.346g / 44.1 g/mol = 4.679 mol
iii) Number of moles of CO₂
- From the balanced chemical equation, the mole ratio is 1 mol C₃H₈ : 1 mol CO₂.
- Hence, 4.679 mol of CO₂ are produced
iv) Convert the number of moles to mass
- mass = number of moles × molar mass
- molar mass of CO₂ = 44.01g/mol
- mass = 4.679 mol × 44.01g/mol = 205.9 g
3. Total mass of CO₂
Add the two values found above:
Round to 3 significant figures: 433g.
