Question

Methane is heated strongly in air to undergo complete combustion. calculate the no. of moles and amount of carbon dioxide formed when 6x10² molecules of methane burn

Answer 1

Reaction Involved-
CH₄ + 2O₂ → CO₂ + 2H₂O

1 mol of CH₄ reacts with 2 mol of O₂ to produce 1 mol of CO₂

Thus,6.022 x 10²³ molecules of CH₄ = 6.022 x 10²³ molecules of CO₂

Thus,
6 x10² molecules of CH_{4 =} 6x10² molecules of CO₂
6x10² molecules of CO₂ = 6 x 10² / 6.022 x 10 ²³ mol = 9.9 x 10^-24 mol

Amount of CO₂ produced
= (Moles) x (Molar mass)
= 9.9 x 10^-24 mol x 44 g/mol
= 435.6 x 10^-24 g