Which of the following compounds will absorb | vedclass

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Question

(C) The heat of solution $(\Delta H)$ represents the enthalpy change when a substance dissolves in a solvent.
$A$ positive value of $\Delta H$ indica

Vedclass · Accepted Answer

$NH_4NO_3$ $(\Delta H = +25.5 \ kJ/mole)$

Vedclass · Answer

(C) The heat of solution $(\Delta H)$ represents the enthalpy change when a substance dissolves in a solvent.
$A$ positive value of $\Delta H$ indicates an endothermic process,meaning heat is absorbed from the surroundings.
$A$ negative value of $\Delta H$ indicates an exothermic process,meaning heat is released to the surroundings.
To absorb the maximum quantity of heat,the compound must have the highest positive value of $\Delta H$.
Comparing the given values:
$HNO_3: -33 \ kJ/mole$
$KCl: +17.64 \ kJ/mole$
$NH_4NO_3: +25.5 \ kJ/mole$
$HCl: -74.1 \ kJ/mole$
The highest positive value is $+25.5 \ kJ/mole$,which corresponds to $NH_4NO_3$.

Which of the following compounds will absorb the maximum quantity of heat when dissolved completely in the same amount of water? The heats of solution of these compounds at $25 \ ^\circ C$ in $kJ/mole$ of each solute is given in brackets.

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