Mole ConceptHard

Question

What mass of carbon disulphide CS2 can be completely oxidized to SO2 and CO2 by the oxygen liberated when 325 g of Na2O2 reacts with water?

Options

A.316.67 g
B.52.78 g
C.633.33 g
D.211.11 g

Solution

2Na2O2 + 2H2O → 4NaOH + O2

CS2 + 3O2 → CO2 + 2SO2

2 mole of Na2O2 ≡ 1 mole of O2 ≡ (1/3) mole CS2

$2 \times 78\text{ g} \frac{1}{3} \times 76\text{ g} $$$\therefore\text{325 g} \frac{76}{3 \times 2 \times 78} \times 325 = 52.78\text{ g}$$

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