Which reaction is endothermic?

a) H2(g) + ½ O2(g) → H2O(g), ΔH = -57.82 kcal
b) ½N2(g) + O2(g) + 8.1 kcal → NO2(g)
c) ½N2(g) + 3/2H2(g) → NH3(g) + 11.0 kcal
d) C(diamond) + O2(g) → CO2, ΔH = -94.50 kcal

Question

Which reaction is endothermic?

a) H2(g) + ½ O2(g) → H2O(g), ΔH = -57.82 kcal
b) ½N2(g) + O2(g) + 8.1 kcal → NO2(g)
c) ½N2(g) + 3/2H2(g) → NH3(g) + 11.0 kcal
d) C(diamond) + O2(g) → CO2, ΔH = -94.50 kcal

korosh23 · Answer

Endothermic and exothermic reaction are different.

korosh23 · Answer

http://www.emsb.qc.ca/laurenhill/science/exo.html

korosh23 · Answer

Remember if energy is showed as -ve it is exothermic  
ex: delta H= -25J
If it is written on the left side
---- +   ----  --> --- + 11kcal or J this is exothermic

Anything opposite of this is endothermic. IF you have any question feel free t let me know and I will clarify it more for you. :)