Q. Mass of methane required to produce 22 g of CO₂ after complete combustion is _____

Mass of Methane for CO₂ Formation | JEE Mains PYQ | Mole Concept

Q. Mass of methane required to produce 22 g of CO₂ after complete combustion is ______ g.

(Given molar mass in g mol⁻¹: C = 12.0, H = 1.0, O = 16.0)

Explanation

Step 1: Write balanced chemical equation

CH₄ + 2O₂ → CO₂ + 2H₂O

Step 2: Calculate moles of CO₂ produced

Molar mass of CO₂ = 12 + (2×16) = 44 g mol⁻¹
Moles of CO₂ = 22 ÷ 44 = 0.5 mol

Step 3: Use mole ratio from equation

1 mole CH₄ produces 1 mole CO₂
So, moles of CH₄ required = 0.5 mol

Step 4: Calculate mass of methane

Molar mass of CH₄ = 12 + (4×1) = 16 g mol⁻¹
Mass of CH₄ = 0.5 × 16 = 8 g

Correct Answer = 8

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