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  • If  is the change in enthalpy and <img alt="\Delta E" src="http://entrancecorner.oncodecogs.com/gif

If \Delta H is the change in enthalpy and \Delta E  the change in internal energy accompanying a gaseous reaction, then

Option: 1

\Delta H is always greater than \Delta E


Option: 2

\Delta H<\Delta E only if the number of moles of the products is greater than the number of the reactants


Option: 3

\Delta H is always less than \Delta E


Option: 4

\Delta H<\Delta E only if the number of moles of the products is less than the number of the reactants


Answers (1)

best_answer

We know this formula

\mathrm{\Delta H = \Delta E - \Delta n_gRT}

From the above formula only possible statement - 

\Delta H<\Delta E only if the number of moles of the products is less than the number of the reactants.

And rest statements are incorrect.

Posted by

Anam Khan

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