**Assertion (A):** Average molecular mass of a mixture of and is always .
**Reason (R):** Both and have the same molar mass ().

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Question

**Assertion (A):** Average molecular mass of a mixture of $N_2$ and $CO$ is always $28$.
**Reason (R):** Both $N_2$ and $CO$ have the same molar mass ($28 ext{ g/mol}$).

Prashant Kotian · Accepted Answer

Correct answer: A. . Since , any linear combination () will always equal 28, regardless of the mixing ratio.

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