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A 12gm sample of CH4 and C2H4 yielded 35.2gm of Co2 on complete oxidation. What was the average molecular mass of the original sample?

A 12gm sample of CH4 and C2H4 yielded 35.2gm of Co2 on complete oxidation. What was the average molecular mass of the original sample?

Grade:12th pass

1 Answers

Arun
25750 Points
5 years ago
  1. CO2 is 12/44 carbon so 9.6 g carbon total
  2. If x is grams methane, carbon content is 12/16*x + 24/28*(12 g - x) = 9.6 g
    leading to 6.4 g CH4 and 5.6 g C2H4
  3. Using their molar masses, 0.4 mol CH4, 0.2 mol C2H4, or 0.6 mol total
  4. 12 g/0.6 mol = 20 g/mol

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