Which of the following gas mixtures has an average molar mass of $30 g/mol$ ? (Molar masses in $g/mol$ : $CH X_{4}$ 16, $CO X_{2}$ 44, $O X_{2}$ 32, $N X_{2}$ 28, $NO$ 30, $C X_{2} H X_{6}$ 30.)

AAn equimolar mixture of $CH X_{4}$ and $CO X_{2}$
BA mixture of $O X_{2}$ and $N X_{2}$ of equal masses
CA mixture of $3 mol$ $O X_{2}$ and $1 mol$ $N X_{2}$
DAny mixture of $NO$ and $C X_{2} H X_{6}$ , in any proportion

Answer: A, D

A: (16 + 44)/2 = 30 (yes). B: equal masses give 2/(1/32 + 1/28) = 29.87 (no). C: (3 x 32 + 28)/4 = 31 (no). D: both components have molar mass 30, so every mixture averages 30 (yes).

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Which of the following gas mixtures has an average molar mass of 30 g/mol? (Molar masses in g/mol: CHX4​ 16, COX2​ 44, OX2​ 32, NX2​ 28, NO 30, CX2​HX6​ 30.)

Answer: A, D

More questions on Average molar mass of mixtures, vapour density

Which of the following gas mixtures has an average molar mass of $30 g/mol$ ? (Molar masses in $g/mol$ : $CH X_{4}$ 16, $CO X_{2}$ 44, $O X_{2}$ 32, $N X_{2}$ 28, $NO$ 30, $C X_{2} H X_{6}$ 30.)