Some Basic Concepts of Chemistry

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)

Answer

8

Solution

CH4 + 2O2 CO2 + 2H2O

Moles of CO2 = 2244 = 0.5 mol

∵ 1 mol CH4 gives 1 mol CO2 ⇒ moles of CH4 = 0.5 mol

∴ Mass of CH4 = 0.5 × 16 = 8 g

Answer: 8