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2NO(2)(g)to N(2)O(4)(g) DeltaU(f)^(@)[N...

`2NO_(2)(g)to N_(2)O_(4)(g)`
`DeltaU_(f)^(@)[N_(2)O_(4)(g)]=2kcal//"moleand "DeltaU_(reaction)^(@)=-16kcal//mol,` then calculate `DeltaH_("formation" )^(@)=-16kcal//mol,` then calculate `DeltaH_("formation")^(@) of NO_(2)at 727^(@)C:`

A

9kcal/mol

B

4.5kcal/mol

C

8kcal/mol

D

10kcal/mol

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The correct Answer is:
c
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