brennahogan018
Answered

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

Answer :

SaltySpark

Answer:

B. ½N2(g) + O2(g) + 8.1 kcal → NO2(g)

Explanation:

Endothermic means that you are absorbing energy. Thus, the answer cannot be A or D, as energy is released, as indicated by a negative enthalpy.

In C, energy is produced(aka released), and this means it is exothermic.

Thus, the answer must be B, where energy is required to produce NO2(meaning it is absborbed.

Other Questions