7. Consider the combustion reaction of ethane. a. Write a balanced chemical reaction.?

[匿名]

2017-02-17 8:26 am

7. Consider the combustion reaction of ethane.
a. Write a balanced chemical reaction.
b. How many moles of oxygen gas are required to completely react with 14.3 mol of ethane?
c. How many grams of oxygen gas are required to completely react with 0.88 mol of ethane?
d. How many moles of carbon dioxide gas are expected to be produced from the complete reaction of 27.7 g of
ethane?
e. How many grams of ethane are needed to produce 125 g of water?

回答 (1)

不用客氣

2017-02-17 8:46 am

7.
a.
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

b.
According to the equation, mole ratio C₂H₆ : O₂ = 2 : 7
No. of moles of O₂ required = (14.3 mol) × (7/2) = 50.1 g

c.
Similarly, no. of moles of O₂ required = (0.88 mol) × (7/2) = 3.08 mol
Molar mass of O₂ = 16.0 × 2 g/mol = 32.0 g/mol
Mass of O₂ required = (3.08 mol) × (32.0 g/mol) = 98.6 g

d.
Molar mass of C₂H₆ = (12.0×2 + 1.0×6) g/mol = 30.0 g/mol
No. of moles of C₂H₆ combusted = (27.7 g) / (30.0 g/mol) = 0.923 mol
According to the equation, mole ratio C₂H₆ : CO₂ = 2 : 4 = 1 : 2
No. of moles of CO₂ produced = (0.923 mol) × 2 = 1.85 mol

e.
Molar mass of H₂O = (1.0×2 + 16.0) g/mol = 18.0 g/mol
No. of moles of H₂O = (125 g) / (18.0 g/mol) = 125/18.0 mol
According to the equation, mole ratio C₂H₆ : H₂O = 2 : 6 = 1 : 3
No. of moles of C₂H₆ = (125/18.0 mol) × (1/3) = 125/54.0 mol
Mass of C₂H₆ needed = (125/54.0 mol) × (30.0 g/mol) = 69.4 g

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