How much heat is evolved when 2 moles of methane (CH4) is burned according to this equation? CH4(g) + 2O2(g) CO2(g) + 2H2O(l) Hcomb = -890 kJ/mol

a. -1780 kJ
b. 445 kJ
c. 1780 kJ
d. 27,400 kJ

Question

How much heat is evolved when 2 moles of methane (CH4) is burned according to this equation? CH4(g) + 2O2(g)  CO2(g) + 2H2O(l) Hcomb = -890 kJ/mol

a. -1780 kJ
b. 445 kJ
c. 1780 kJ
d. 27,400 kJ

chmvijay · Answer

can you tell in equation how may moles of CH4 is burned and how much heat is released

anonymous · Answer

2 moles are burned in this equation and i'm not sure about the heat. can you show me how to do it to get an answer?

chmvijay · Answer

see in equation beside the CH4 is nothing means its only 1 mole and the H comb mean the amount of energy released that is around -890 KJ /mol
for 1 mol combustion it gives -890 Kj/mol 
then for 2 mol combustion it gives= x
can you do the calculation now

anonymous · Answer

yes it would be -1780 kJ. correct?

chmvijay · Answer

yaaaa:)