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  4. In a reaction, all reactant and products are liquid, then

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Q. In a reaction, all reactant and products are liquid, then

Thermodynamics

Solution:

$\because$ All reactants and products are liquid,
hence, $\Delta n_{g}=0$
where, $\Delta n _{ g}$ signifies change in moles of gaseous substances.
$\therefore \Delta H =\Delta U +\Delta n _{g} RT$
or, $\Delta H =\Delta U$