A gas sample contains 11 g of CO2, 28 g of N2 and 8 g of O2. Find its average molar mass in g mol^-1, to two decimals (C = 12, N = 14, O = 16).

JEE Main levelNumerical answerDifficulty 2 of 3mc209

A gas sample contains $11 g$ of $CO X_{2}$ , $28 g$ of $N X_{2}$ and $8 g$ of $O X_{2}$ . Find its average molar mass in $g mo l^{- 1}$ , to two decimals (C = 12, N = 14, O = 16).

Numerical answer type, answer in g/mol, tolerance 0.01.

Moles: CO2 = 0.250, N2 = 1.00, O2 = 0.250; total = 1.50 mol. Total mass = 11 + 28 + 8 = 47 g. Average M = 47/1.50 = 31.33 g/mol.

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