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For hydrogen gas, Cp − Cv = a and for oxygen gas, Cp − Cv = b, so the relation between a and b is given by

1. a = 16 b
2. 16 b = a
3. a = 4 b
4. a = b

Correct answer: a = b

Solution

The relation Cp − Cv = R holds for all ideal gases, regardless of their molecular mass or type. Since both hydrogen and oxygen are ideal gases, a = b.

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