Question

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left after cooling to room temperature is

Options

• 40 ml CO₂ gas

• 40 ml CO₂ gas and 80 ml H₂O gas

• 60 ml CO₂ gas and 60 ml H₂O gas

• 120 ml CO₂ gas

Answer 1

40 ml CO₂ gas

Explanation:

\[\ce{CH4_{(g)} + 2O2_{(g)} -> CO2_{(g)} + 2H2O_{(l)}}\]

Content	CH4	O2	CO2
Stoichiometric coefficient	1	2	1
Volume of reactants allowed to react	40 mL	80 mL	-
Volume of reactant reacted and product formed	40 mL	80 mL	40 mL
Volume of gas after cooling to the room temperature	-	-	-

Since the product was cooled to room temperature, water exists mostly as liquid. Hence, 40 ml CO₂ gas is correct.