Discussion
How many moles of methane are required to produce 11 g CO2(g) after combustion? (Molar mass of CO2 = 44 g mol-1)
Answer: A
The amount of methane needed is 0.25 mol.
Combustion of methane gives one CO2 per CH4: CH4 + 2O2 → CO2 + 2H2O.
\[ \begin{aligned} n(\mathrm{CO_{2}}) &= \frac{11}{44} = 0.25\ \text{mol} \\ &= n(\mathrm{CH_{4}}) \end{aligned} \]
0.5 mol would give 22 g of CO2, and the larger values more still. The answer equals the moles of CO2 because the mole ratio is 1 : 1.
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