Mole ConceptHard

Question

Minimum amount of Ag2CO3 (s) required to produce sufficient oxygen for the complete combustion of C2H2 which produces 11.2 ltr of CO2 at S.T.P after combustion is:           [Ag = 108]
Ag2CO3 (s) → 2Ag (s) + CO2 (g) + O2 (g)
C2H2 + 5/2O2 → 2CO2 + H2O

Options

A.276 g
B.345 g
C.690 g
D.1380 g

Solution

Ag2CO3 (s) → 2Ag (s) + CO2 (g) + 1/2O2 (g)
C2H2 + 5/2O2 → 2CO2 + H2O
By Stoichiometry of reaction
Moles of CO2 formed =
Moles of O2 required =
∴ Moles of Ag2CO3 required  = 2 ×
Mass of Ag2CO3 required = × 276 = 345 g

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