SATHEE: Chemical Thermodynamics Question 336

Chemical Thermodynamics Question 336

Question: If bond enthalpies of $N \equiv N, H - H$ and $N - H$ bonds are $x_{1}, x_{2}$ and $x_{3}$ respectively, $Δ H_{f}^{o}$ for $N H_{3}$ will be

Options:

A) $x_{1} + 3 x_{2} - 6 x_{3}$

B) $1 / 2 x_{1} + 3 / 2 x_{2} - 3 x_{3}$

C) $3 x_{3} - 1 / 2 x_{1} - 3 / 2 x_{2}$

D) $6 x_{3} - x_{1} - 3 x_{2}$

Show Answer

Answer:

Correct Answer: B

Solution:

$\frac{1}{2} N_{2} + \frac{3}{2} H_{2} \overset{}{\to} N H_{3}$

$\frac{1}{2} x_{1} + \frac{3}{2} x_{2} - 3 x_{3}$

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Chemical Thermodynamics Question 336

Question: If bond enthalpies of N≡N,H−H and N−H bonds are x1,x2 and x3 respectively, ΔHfo for NH3 will be

Options:

Answer:

Solution:

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Question: If bond enthalpies of $N \equiv N, H - H$ and $N - H$ bonds are $x_{1}, x_{2}$ and $x_{3}$ respectively, $Δ H_{f}^{o}$ for $N H_{3}$ will be