17.0 , g of NH _ 3 completely vapourises at -33.42^ C and 1 , bar… - Vidyadip

MCQ

$17.0\, g$ of $NH _{3}$ completely vapourises at $-33.42^{\circ} C$ and $1\, bar$ pressure and the enthalpy change in the process is $23.4 \,k\,J\, mol ^{-1}$. The enthalpy change for the vapourisation of $85 g$ of $NH _{3}$ under the same conditions is $.....\, kJ .$

A
$81$
✓
$117$
C
$453$
D
$751$

✓

Answer

Correct option: B.

$117$

b
Given data is for $1 \,moles$ and asked for $5\, moles$ so value is $23.4 \times 5=117\, kJ$

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