First slide

Relation between Delta H and Delta U

Question

The heat of combustion of solid benzoic acid at constant volume is – 321.30 KJ at 27⁰C. The heat of combustion at constant pressure is

Easy

Solution

$\large {C_6}{H_5}COO{H_{(s)}}\; + \;\frac{{15}}{2}{O_2}_{_{(g)}}\; \to \;7C{O_{{2_{(g)}}}}\; + \;3{H_2}{O_{(l)}}\$

Δn_(g) = 7-15/2 = -1/2
ΔH = ΔE + Δn_(g) RT = -321.30+(-1/2)R x 300
= -321.30-150R

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