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Heat exchanged in a chemical in a chamical reaction at constant temperature and pressure is calledA. entropyB. EnthalpyC. internal energyD. free energy |
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Answer» Correct Answer - B According to thermodynamics, `Delta H = Delta U + P Delta V` (`T` and `P` constant) `= q + ( - P Delta V) + P Delta V` `= q` (`T`, `P` constant) Thus, heat exchanged by the system with its surroundings at constant `T` and `P` is called enthalpy change. Hence, `Delta H` is sometimes called the heat of reaction at constant `P`. |
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