Question

Calculate the amount of carbon dioxide that could be produced when 2 moles of carbon are burnt in 16 g of dioxygen.

Answer 1

For burning carbon in oxygen: \[\ce{C + O2 -> CO2}\]

Molar masses

C : 12 g/mol
O₂​ : 32 g/mol

Given data

Moles of C: 2 mol
Mass of O₂​: 16 g
Moles of O₂ = `16/32` = 0.5 mol

​Limiting reagent check

1 mol C reacts with 1 mol O₂

Required O₂ for 2 mol C = 2 mol

Available O₂ = 0.5 mol

So, O₂ is the limiting reagent.

Moles of CO₂​ formed

1 mol O₂ → 1 mol CO_2​
0.5 mol O₂​ → 0.5 mol CO₂
Mass of CO₂
Molar mass of CO₂ = 44 g/mol
Mass = 0.5 × 44 = 22g