Answer
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Work Step by Step
The person who claims that the temperature of the mixture can be higher than the temperatures of the components is right since the total enthalpy of the mixture of two components at the same pressure and temperature, in general, is not equal to the sum of the total enthalpies of the individual components before mixing, the difference being the enthalpy (or heat) of
mixing, which is the heat released or absorbed as two or more components are mixed isothermally.
