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A mixture of hydrogen and oxygen has volume 500 cm³, temperature 300 K, pressure 400 kPa and mass 0.76 g. The ratio of masses of oxygen to hydrogen will be:-

1. 3: 8
2. 2: 3
3. 16: 3
4. 8: 3

Correct answer: 16: 3

Solution

The correct option is based on the molar masses of hydrogen and oxygen, where the molar mass of hydrogen (H2) is approximately 2 g/mol and that of oxygen (O2) is about 32 g/mol. By applying the ideal gas law and the given conditions, we can derive the mass ratio of oxygen to hydrogen, which simplifies to 16:3.

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