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m = 100 gram = 0,1 kg
U = 0,85 x 10^6 J/Kg
ditanyakan = Q atau banyak energi yg diperlukan utk menguapkan alkohol itu?
jawab
Q = m x U
Q = 0,1 x 0,85 x 10^6
Q = 1 x 10^-1 x 85 x 10^-2 x 10^6
Q = 1 x 85 x 10^(6-2-1)
Q = 1 x 85 x 10^3
Q = 85.000 J
Q = 85 KJ
= 0,1 kg × 0,85 × 10⁶ J/kg
= 85.000 J
= 85 kJ