(A)The standard enthalpy of an overall reaction is the sum of the enthalpy changes in individual reactionsCorrect
(B)Enthalpy of formation of a compound is same as the enthalpy of decomposition of the compound into constituent elements, but with opposite sign
(C)At constant temperature the pressure of a gas is inversely proportional to its volume
(D)The mass of a gas dissolved per litre of a solvent is proportional to the pressure of the gas in equilibrium with the solution
Answer: (A)
Solution
Hess's law of constant heat summation states that the total enthalpy change of a reaction is the same whether it occurs in one step or several steps, i.e., the overall enthalpy is the sum of the
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