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?
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?
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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)
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)