Question

Based on the enthalpy changes given for the reactions, which reactions are endothermic?

2H2O → 2H2 + O2, ΔH = 484 kJ
C + O2 → CO2, ΔH = -394 kJ
H2 + Br2 → 2HBr, ΔH = -73 kJ
2NH3 → N2 + 3H2, ΔH = 92 kJ

Answer 1

Answer:

the first and last

Explanation:

the enthalpy Change is positive.

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Answer 2

Answer:

One (2H2O → 2H2 + O2, ΔH = 484 kJ )

Four (2NH3 → N2 + 3H2, ΔH = 92 kJ)

Explanation:

An endothermic process is any process with an increase in the enthalpy H of the system. So if it has a positive result then the heat is going up which means it is endothermic .