Enthalpy of formation help
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Enthalpy of formation help

[From: ] [author: ] [Date: 12-06-04] [Hit: ]
Can somebody please help me with this question and explain thereasoning behind the answer?-The enthalpy of formation is always for _one_ mole of the target substance.a.To make it be a formation reaction,......
In which of the reactions below is ΔH not an enthalpy of formation?
a. 2C(s) + O2(g) --> 2CO(g)
b. C(s) + O2(g) --> CO2(g)
c. Mg(s) + Cl2(g) -->MgCl2(s)
d. Ca(s) + 1/2O2(g) --> CaO(s)
e. Both b and c are not enthalpy of formation reactions.

Can somebody please help me with this question and explain thereasoning behind the answer?

-
The enthalpy of formation is always for _one_ mole of the target substance. The equation that is not a formation reaction is this one:

a. 2C(s) + O2(g) --> 2CO(g)

To make it be a formation reaction, we would write this:

C(s) + (1/2)O2(g) --> CO(g)
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