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Equal masses of two gases in a container: ratio or fraction of their partial pressures

The same question, asked 2 times: 12 May 2024 S2*, 26 Apr 2025 S1. Every wording below, oldest first.

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  1. Question 1

    12 May 2024 S2

    86
    Equal masses of H2(g)H_2(g) and He(g)He(g) are enclosed in a container at constant temperature. The ratio of partial pressure of H2H_2 to He is

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  2. Question 2

    26 Apr 2025 S1

    63
    Equal masses of helium and oxygen are mixed in an empty container at 25∘C25^{\circ}C. What is the fraction of the total pressure exerted by helium?

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