1(xii)
What volume of carbon dioxide is produced at STP when 5 litres of propane is burnt completely according to the equation given below?
C3H8 + 5O2 ⟶ 3CO2 + 4H2O
- (a)10 litres
- (b)15 litres
- (c)20 litres
- (d)25 litres
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15 litres
Reason — 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 × 3 = 15 litres of CO2.