How many kilojoules are required to melt 15g of ice at 0c and raise the temperature of the liquid that forms to 85c?

Answer : The heat required is, 10.3178 KJ

Solution :

The conversions involved in this process are :

Now we have to calculate the enthalpy change.

where,

= enthalpy change or heat required = ?

m = mass of water = 15 g

= specific heat of liquid water =

n = number of moles of water =

= enthalpy change for fusion = 6.01 KJ/mole = 6010 J/mole

Now put all the given values in the above expression, we get:

    (1 KJ = 1000 J)

Therefore, the enthalpy change is, 10.3178 KJ

there are two significant figures.