Verified answer

ΔH = ΔE + ΔngRT

where ΔH = 38.7 kj/mole = 38700 j/mole

R = 8.314 j/K/mole

T = 78 + 273 = 351 K

for vaporization ...

CH3CH2OH (l) ----------> CH3CH2OH (g)

so Δng = the difference between no.of moles of gaseous products and gaseous reactants = 1 - 0 = 1

putting the values...

38700 = ΔE + 1 X 8.314 X 351

38700 = ΔE + 2918.214

ΔE = 38700 - 2918.214 = 35781.786 j/mole = 35.8 kj/mole

feel free to ask any question

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