Question

For the reaction,
$ {{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\xrightarrow{{}}3C{{O}_{2}}(g)+4{{H}_{2}}O(l) $
at constant temperature, $ \Delta H-\Delta E $ is

• A. $ +\,3RT $
• B. $ -RT $
• C. $ +\,RT $
• D. $ -3RT $

Answer 1

Answer: (D)

For the given reaction,
$ \Delta {{n}_{g}}={{n}_{p}}-{{n}_{R}}=3-6=-3 $
$ \Delta H=\Delta E+\Delta {{n}_{g}}RT $
$ \Delta H-\Delta E=\Delta {{n}_{g}}RT $
$ \Delta H-\Delta E=-3RT $