Answer to Question #63877 in General Chemistry for isabel sanchez

Question

How much heat is required to convert 35.0 g of ethanol at -168 ∘C to the vapor phase at 78 ∘C?

Answer 1

The enthalpy of vaporization is 38.56 kJ/mol. The specific heat of liquid ethanol is 2.3 J/g−K.
q = m x C xΔT + m (ΔH/M)
q = 35.0g x 2.3J/goC x (78 + 168)oC + 35.0g x 837 J / g
q = 19803 J + 29295 J = 49.09 kJ
Answer 49.09 kJ