Question

How much heat is given off when 32g liquid methanol (CH3OH) at its freezing point changes to solid methanol? (Methanol HF=3.16 kJ/mol)

A)1.58 kJ
B)3.16 kJ
C)0.79 kJ
D) 0.18 kJ

Answer 1

3.16 kj

Step-by-step explanation:

Answer 2

The correct answer is option B.

Step-by-step explanation:

Mass of methanol = 32 g

Molar mass of methanol = 32 g/mol

Moles of methanol =
`(32 g)/(32 g/mol)=1 mol`

Heat of fusion of methanol =
`\Delta H_f=3.16 kJ/mol`

Amount energy released when 1 mol of methanol is freezes = 3.16 kJ

The correct answer is option B.