The enthalpy change, in kJ, for the sublimation of one mole of N2O5 solid to

M

MosDef

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gas would be represented by ? 7. Consider the following two thermochemical equations:

N2(g) + 5/2O2(g) ---> N2O5(s) ?H = x kJ

N2(g) + 5/2O2(g) ---> N2O5(g) ?H = y kJ


A.
x + y

B.
-x - y

C.
xy

D.
y - x

E.
x - y
 
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