Chem help on thermo?

Question

2 C2H2(g) + 5O2 (g)--> 2H2O(g) + 4 CO2(g)

if the Delta H is -2511 KJ find the molar heat of formation for C2H2

is this answer for this 226.7KJ?

Answer 1

No. There are two moles of C2H2 involved; the molar heat of formation of C2H2 is thus 2511/2 = 1256 kJ.