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Based on the enthalpy changes given for the reactions, which reactions are endothermic? (check all that apply)

2H2O → 2H2 + O2, ΔH = 484 kJ

C + O2 → CO2, ΔH = -394

kJ H2 + Br2 → 2HBr, ΔH = -73

kJ 2NH3 → N2 + 3H2, ΔH = 92 kJ

Respuesta :

ivana2103
In an endothermic reaction, “delta H” is always positive, since the system is absorbing heat from its surroundings, not releasing into the surroundings like in an exothermic reaction where the delta H is always negative.

So our endothermic reactions would be the first (484kJ) and the last (92kJ).

Answer:

Based on the given bond energies, what is the enthalpy change for the chemical reaction?

A.

-352 kJ

B.

-210 kJ

C.

-176 kJ

D.

-105 kJ

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Explanation:

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