# Question 9fc6b

Feb 28, 2016

You need 1.07 kJ of energy to melt 3.2 g of ice at 0 °C.

#### Explanation:

The formula for the energy needed is

q =mΔH_"fus", where

$q$ is the heat energy required

$m$ is the mass of the ice

ΔH_"fus" is the enthalpy of fusion (i.e. the energy required to melt 1 g of ice)

For ice, ΔH_"fus" = "333.55 J /g"

Hence,

q = 3.2 color(red)(cancel(color(black)("g ice"))) × "333.35 J"/(1 color(red)(cancel(color(black)("g ice")))) = "1070 J" = "1.07 kJ"#