Chemical Thermodynamics Question 415
Question: The free energy change for the following reactions are given below, $ C_2H_2(g)+\frac{5}{2}O_2(g)\to $
$ 2CO_2( g )+H_2O( l );\Delta G{}^\circ =-1234kJ $
$ C( s )+O_2( g )\to CO_2( g );\Delta G{}^\circ =-394kJ $
$ H_2(g)+\frac{1}{2}O_2(g)\to H_2O(l);\Delta {{G}^{{}^\circ }}=-237kJ $ What is the standard free energy change for the reaction $ H_2(g)+2C(s)\xrightarrow{{}}C_2H_2(g) $
Options:
A) $ -209,kJ $
B) $ -2259,kJ $
C) $ +2259,kJ $
D) $ 209,kJ $
Show Answer
Answer:
Correct Answer: D
Solution:
- By $ 2\times $ (ii) - (i) + (iii) $ H_2(g)+2C(s)\to C_2H_2(g),\Delta {{G}^{{}^\circ }}=209kJ $
