Answer to Question #102283 in General Chemistry for Jay Jones

Question

Isopropyl alcohol,CH3CHOHCH3, is used in rubbing alcohol mixtures. How much heat is absorbed by alcohol if 10.0grams evaporates. The heat of vaporation is 42.1 kJ/mol

Answer 1

n(CH3CHOHCH3) = m(CH3CHOHCH3)/m(CH3CHOHCH3) = 10.0g/60g/mol = 0.1667mol.

Q = L(CH3CHOHCH3) * n(CH3CHOHCH3) = 42.1 kJ/mol * 0.1667mol = 7.02kJ.