(C) According to the first law of thermodynamics,at constant volume,the heat exchanged $(Q_v)$ is equal to the change in internal energy ($\Delta E$ o

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(C) According to the first law of thermodynamics,at constant volume,the heat exchanged $(Q_v)$ is equal to the change in internal energy ($\Delta E$ or $\Delta U$).Therefore,$Q_v = \Delta E = E_P - E_R$,where $E_P$ is the internal energy of the products and $E_R$ is the internal energy of the reactants.