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Stoichiometry

ΔfGo for NH...

Question

$Δ_{f} G^{o}$ for $N H_{4} O H (a q) ⇌ N H_{4}^{+} (a q) + O H^{-} (a q)$ is about:

27.07 k J m o l^{- 1}

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54.14 k J m o l^{- 1}

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- 27.07 k J m o l^{- 1}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

- 54.14 k J m o l^{- 1}

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Solution

The correct option is B $27.07 k J m o l^{- 1}$
$K_{b} = 1.8 \times 10^{- 5}$
$Δ_{f} G_{r x n}^{o}$ for $N H_{4} O H (a q) ⇌ N H_{4}^{+} (a q) + O H^{-} (a q)$
$= - 2.303 \times R \times T log K_{b}$
$= - 2.303 \times 8.314 \times 298 log (1.8 \times 10^{- 5})$
$= 27.07$ $k J$ $m o l^{- 1}$

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