Stoichiometry
What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?

43864
L/3 x 298/273
43832
43833

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Stoichiometry
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

Only OH⁻ and H⁺ ions react in every case
The strong base and strong acid reacts in aqueous solution
The salt formed does not hydrolyse
The strong base and strong acid reacts completely

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