Consider the reaction:P4 (s)+ 6 Cl2 (g) = 4PCl3(g)

Question

Delt H = -1230 kJ
How much heat is released when 52.5 of Cl2 (g) reacts with an excess of P4 (s)?

I tried the question and got -910.8 kJ and the answer is suppose to be -/+ 152 kJ.

Answer 1

Moles Cl2=52.5/70.9=.74 moles
heat released= .74/6*1230=-152 kJ

Answer 2

but....0.74/6*1230= 0.74/7380=0.000100271 moles..

Answer 3

(0.74/6)1230=152kj