Question

For gaseous reactions, if $\Delta H$ is the change in enthalpy and $\Delta U$ that in internal energy, then

• A. $\Delta H$ is always greater $\operatorname{than} \Delta U$
• B. $\Delta H$ is always less than $\Delta U$
• C. $\Delta H< \Delta U$ only if the number of mole of the products is less than that of the reactants
• D. $\Delta U< \Delta H$ only if the number of mole of the reactants is less than that of the products

Answer 1

Answer: (C), (D)

Correct answer is (c) $\Delta H< \Delta U$ only if the number of mole of the products is less than that of the reactantsCorrect answer is (d) $\Delta U< \Delta H$ only if the number of mole of the reactants is less than that of the products