Question

2)Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf?

a) FeO(s) + CO2(g) -> FeCO3(s)
b) 1/2 N2(g) + 2 O(g) -> NO2(g)
c) 2 Na(s) + Cl2(g) -> 2 NaCl(s)
d) Ba(s) + N2(g) + 3 O2(g) -> Ba(NO3)2(s)

e) more than one of the four equations above are standard enthalpies of formation.

I chose answer e.

For number 2 did you mean that my answer choice of e was correct or that just equation d is correct? Thank you for your help!!

Answer 1

Just d is correct. Which other one did you think was correct.
a. compounds on the left rule it out.
b. O not standard; rule it out.
c. more than 1 mole not allowed; rule out
d. ok.
e. only d is correct.

Answer 2

O ok I thought that b was correct also but I see now why it is not.