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Mixture of two gases with given volume, temperature, pressure and mass: amount of each gas

The same question, asked 3 times: 2021 Paper 23*, 27 Jun 2022*, 2 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    2021 Paper 23

    15
    A mixture of hydrogen and oxygen has volume 500 cm3500{\text{ }cm}^{3}, temperature 300 K300\text{ }K, pressure 400kPa400kPa and mass 0.76 g0.76\text{ }g. The ratio of masses of oxygen to hydrogen will be:

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  2. Question 2

    27 Jun 2022

    20
    A mixture of hydrogen and oxygen has volume 2000 cm32000{\text{ }cm}^{3}, temperature 300 K300\text{ }K, pressure 100kPa100kPa and mass 0.76 g0.76\text{ }g The ratio of number of moles of hydrogen to number of moles of oxygen in the mixture will be:

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  3. Question 3

    2 Apr 2026 S2

    9
    A mixture of carbon dioxide and oxygen has volume 8310 cm38310{\text{ }cm}^{3}, temperature 300 K , pressure 100 kPa and mass 13.2 g . The number of moles of carbon dioxide and oxygen gases in the mixture respectively are ____\_\_\_\_ .(Assume both carbon dioxide and oxygen gases behave like ideal gases) [ R=8.31 J/mol.KR = 8.31\text{ }J/mol.K ]

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