Stoichiometry
Equal masses of CH₄ and H₂ are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is

1/2
8/9
1/9
5/9

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Stoichiometry
Heat of reaction is not influenced by

Whether the reaction is carried out at constant temperature or constant pressure
None of these
The route/method through which final products are obtained
The physical state (e.g., solid, liquid or gaseous) of reactants and products

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