Substance A_2B(g) can undergoes decomposition to form two set of … - Vidyadip

MCQ

Substance $A_2B(g)$ can undergoes decomposition to form two set of products If the molar ratio of $A_2(g)$ to $A(g)$ is $5 : 3$ in a set of product gases, then the energy involved in the decomposition of $1\, mole$ of $A_2B(g)$ is

${A_2}B(g) \to {A_2}(g) + B(g);\,\,\,\Delta {H^o} = 40\,kJ/mol$

${A_2}B(g) \to A(g) + AB(g);\,\,\,\Delta {H^o} = 50\,kJ/mol$

.....$ kJ/mol$

A
$48.75$
✓
$43.75$
C
$46.25$
D
None of these

✓

Answer

Correct option: B.

$43.75$

b
${\Delta _r}H = \frac{5}{8} \times 40 + \frac{3}{8} \times 50 = 43.75\,kJ/mol$

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