While 250 mol of ch4 reacts with excess cl2 at constant pressure according to the chemical equation shown below. 177 kJ of heat are released. Compute the value of delta H for this
2CH4(g) + 3 Cl2(g)---> 2CHCl3(l) + 3H2(g)
a)-1420 kJ
b)-708 kJ
c) +708 kJ
d) +1420 kJ