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What will be the heat of reaction for th...

What will be the heat of reaction for the following reaction? Will the reaction be exothermic or endothermic?
`Fe_(2)O_(3(s))+3H_(2(g))rarr 2Fe_((s))+3H_(2)O_((l))`
`Delta_(f)H^(@)(H_(2)O,l)=-"285.83 kJ mol"^(-1)`
`Delta_(f)H^(@)(Fe_(2)O_(3),s)=-"824.2 kJ mol"^(-1)`

A

`-"824. 2 kJ mol"^(-1),` exothermic

B

`+"33.3 kJ mol"^(-1),` endothermic

C

`-"33.3 kJ mol"^(-1)`, exothermic

D

`+"824.2 kJ mol"^(-1),` endothermic

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta_(f)H^(@)(Fe_((s)))=0, Delta_(f)H^(@)(H_(2(g)))=0`
`Delta_(r)H^(@)=3(-285.83)-1(-824.2)`
`=-857.5+824.2=-33.3"kJ mol"^(-1)`
Reaction is exothermic.
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