# Assume each reaction is carried out in an open container. For which reaction will ΔH = ΔE?

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Assume each reaction is carried out in an open container. For which reaction will ΔH = ΔE?

(a) 2CO(g) + O2(g) → 2CO2(g)

(b) H2(g) + Br2(g) → 2HBr(g)

(c) C(S) + 2H2O(g) → 2H2(g) + CO2(g)

(d) PCl5(g) → PCl3(g) + Cl2(g)

by (10 points)
why option 3 is not correct
by (10 points)
To calculate 'ng' we require the number of gaseous molecules but, if you look closely, in the third equation, Carbon is in its solid form. Therefore, we do not include this while calculating the gaseous molecules.

+1 vote
by (68.2k points)
selected

The correct option is : (b) H2(g) + Br2(g) → 2HBr(g)

Explanation:

by (10 points)
Why option 3 is not correct