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Question
Calculate the amount of carbon dioxide that could be produced when 2 moles of carbon are burnt in 16 g of dioxygen.
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Solution
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 CO2
0.5 mol O2 → 0.5 mol CO2
Mass of CO2
Molar mass of CO2 = 44 g/mol
Mass = 0.5 × 44 = 22g
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