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Total pressure after a gas reaction in a closed vessel

This type of question, asked 2 times: 2021 Paper 17, 24 Jan 2025. All 2 questions below, oldest first.

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  1. Question 1

    2021 Paper 17

    53
    2SO2( g)+O2( g)→2SO3( g)2SO_{2}(\text{ }g) +O_{2}(\text{ }g) \rightarrow 2SO_{3}(\text{ }g) The above reaction is carried out in a vessel starting with partial pressure PSO2=250mbarP_{SO_{2}}= 250mbar, PO2=750 mP_{O_{2}}= 750\text{ }m bar and PSO3=0P_{SO_{3}}= 0 bar. When the reaction is complete, the total pressure in the reaction vessel is mm bar. (Round off of the nearest integer).

  2. Question 2

    24 Jan 2025

    39
    For a reaction, N2O5( g)→2NO2( g)+12O2( g)N_{2}O_{5(\text{ }g)}\rightarrow 2NO_{2(\text{ }g)}+\frac{1}{2}O_{2(\text{ }g)} in a constant volume container, no products were present initially. The final pressure of the system when 50%50\% of reaction gets completed is

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