Mole ConceptHard

Question

A mixture of methane and ethylene in the ratio of a: b by volume occupies 30 ml. On complete combustion, the mixture yields 40 ml of CO2. What volume of CO2 would have been obtained if the ratio would have been b:a?

Options

A.50 ml
B.30 ml
C.40 ml
D.60 ml

Solution

CH4 → CO2 and C2H6 → 2CO2

ax + bx = 30 and ax + 2bx = 40

⇒ ax = 20, bx = 10 ⇒ a: b = 2: 1

For b: a ratio, CH4 = 10 mL and C2H6 = 20 mL

⇒ CO2 formed = 10 + 2 × 20 = 50 mL

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