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, $ \Delta H_{f}^{o} $ for $ NH_3 $ will be
Options:
A) $ x_1+3x_2-6x_3 $
B) $ 1/2x_1+3/2x_2-3x_3 $
C) $ 3x_3-1/2x_1-3/2x_2 $
D) $ 6x_3-x_1-3x_2 $
Show Answer
Answer:
Correct Answer: B
Solution:
$ \frac{1}{2}N_2+\frac{3}{2}H_2\xrightarrow{{}}NH_3 $
$ \frac{1}{2}x_1+\frac{3}{2}x_2-3x_3 $
