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mr = 2C + 2H
mr = 2(12) + 2(1)
mr = 26
mol asetilena = 13 gr / 26 gr mol⁻¹
mol asetilena = 0,5 mol
sehingga :
perubahan entalpi pembentukan 13 gr asetilena
ΔH°f = 0,5 mol x 226,7 kj mol⁻¹
ΔH°f = 113,35 kj