QQuestion
What volume of carbon dioxide is produced at STP when 5 litres of propane is burnt completely according to the equation given below?
\mathrm{C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O}(a) 10 litres
(b) 15 litres
(c) 20 litres
(d) 25 litres
✓Answer
(b) 15 litres
Explanation –
According to Gay-Lussac’s law of gaseous volumes, when gases react they do so in volumes which bear a simple whole number ratio to one another, given temperature and pressure remain constant.
From the equation: 1 volume of C3H8 produces 3 volumes of CO2.
∴ 5 litres of C3H8 will produce 5 \times 3 = 15\text{ litres of }\mathrm{CO_2}.
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