Question

How much energy is needed to melt 161.0 g of ethanol(C₂H₅OH)?(Heat of fusion Ethanol- 5.02 KJ/mol)

Answer 1

17.6kJ

Step-by-step explanation:

The mass of ethanol given is 161.g

Now we first find the number of moles from this.

Number of moles =
`(mass)/(molar mass)`

Molar mass of C₂H₅OH = 2(12) + 5(1) + 16 + 1 = 46g/mol

Number of moles of ethanol =
`(161)/(46)` = 3.5mol

Since the heat of fusion is 5.02kJ/mol;

Heat of fusion is a measure of the amount of energy needed to melt a substance.

Amount of energy needed to melt = 3.5mol x 5.02kJ/mol

= 17.6kJ