Q.How many moles of ethane are required to produce 44 g of CO₂(g) after combustion?

Stoichiometry (Greek: stoicheion = element, metron = measure) is the quantitative mole relationship between reactants and products fixed by a balanced chemical equation. The relationship is written with the symbol '≡' ("stoichiometrically equal to"): for C(s) + O₂(g) → CO₂(g), 1 mole of C ≡ 1 mole of O₂ ≡ 1 mole of CO₂.

The real power of stoichiometry is that moles, mass and gas volume are all freely inter-convertible: …