| \[{{C}_{2}}{{H}_{4}}\left( g \right)+6{{F}_{2}}\left( g \right)\xrightarrow{{}}2C{{F}_{4}}\left( g \right)+4HF\left( g \right)\] |
| \[{{H}_{2}}(g)+{{F}_{2}}(g)\xrightarrow{{}}2HF(g);\Delta H_{1}^{{}^\circ }=-537kJ\] |
| \[C\left( s \right)+2{{F}_{2}}\left( g \right)\xrightarrow{{}}C{{F}_{4}}\left( g \right);\text{ }\Delta H_{2}^{{}^\circ }=-680\text{ }kJ\] |
| \[2C\left( s \right)+2{{H}_{2}}\left( g \right)\xrightarrow{{}}{{C}_{2}}{{H}_{4}}\left( g \right);\Delta H_{3}^{{}^\circ }=52kJ\] |
A) \[~-1165\]
B) \[-2486\]
C) \[+1165\]
D) \[+2486\]
Correct Answer: B
Solution :
[b] \[\Delta {{H}^{{}^\circ }}=2\times \Delta H_{1}^{{}^\circ }+2\times \Delta H_{2}^{{}^\circ }-\Delta H_{3}^{{}^\circ }=-2486\,kJ\]
You need to login to perform this action.
You will be redirected in
3 sec
