Give reasons:
(a) Neither q nor w is a state function but q + w is state function.
(b) The dissolution of ammonium chloride in water is endothermic still it dissolves in water.
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q + w = ΔU. As ΔU is a state function, hence q + w is a state function.
On dissolution, entropy increases i.e., ΔS is +ve. If TΔS > ΔH,
then ΔG will be –ve. Hence, the process is spontaneous.