Question

What is the total amount of heat needed to convert 1.00g of ice at -8.1 C to liquid water at 8.1C .. answer in kj

Answer 1

Q = m cp dT
where:
Q - heat
m - mass of ice
cp - heat capacity of wter
dT - temperature difference in kelvin

Answer 2

Hi Kryten! I'm afraid you have forgotten the melting of the ice.

Heat needed is sum of three terms:
- heat to raise ice temperature to 0 °C (see Kryten's formula)
- heat to fully melt ice to water at 0 °C
- heat to raise water temperature from 0 °C to 8.1 °C.

Answer 3

Hi Vincent, long time no see :)
yes Vincent is right, i forgot heat needed to melt the ice, my mistake!