During a laboratory experiment, 3.0 g of pure methane gas is burnt completely in excess oxygen. Calculate the volume of carbon dioxide produced at NTP (assume 1 mol gas = 22.4 L).
Answer
4.2 L
The correct answer is 4.2 L — – Hence volume of CO₂ is 4.2 L.
Step-by-step solution
- Find the molar mass of CH₄: 16 g mol∑.
- Calculate moles of methane: 3.0 g ÷ 16 g mol∑ = 0.1875 mol.
- Complete combustion produces 1 mole CO₂ per mole CH₄.
- Moles of CO₂ = 0.1875 mol.
- Use ideal gas volume at NTP: 0.1875 mol × 22.4 L mol∑ = 4.2 L.
- – Hence volume of CO₂ is 4.2 L.
Common mistake: Using mass of CO₂ instead of moles for volume calculation
Concept tested: Combustion volume calculation
Published · How this solution was prepared and checked
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