00:01
You need to carry out the calculations in steps.
00:06
And the steps will be, say you start with a cold block of ice.
00:11
The first step is to warm the ice to the melting point.
00:15
The second step is to melt the ice.
00:17
The third step is to warm the water that you just created.
00:21
Say you warm it all the way up to the boiling point of water.
00:26
Then the next step is to vaporize the water, where you'd use.
00:31
Delta h of vaporization and then the final step if you needed to warm the steam up to something above 100 degrees celsius then you would calculate that energy also for this process we don't need to do all of those steps we just need to do the first three we need to warm the block of ice we need to melt the block of ice and we need to warm the water to 70 degrees celsius to calculate the energy required to warm the block of ice we'll use the heat where q is equal to the specific heat of ice, multiplied by the mass of ice, 1 mole of ice is 18 .015 grams.
01:13
Multiplied by the change in temperature, we're going to go from negative 50 degrees celsius up to 0 degrees celsius, as the change of 50 degrees celsius, giving us 1 ,883 joules, or 1 .883 kilojoules.
01:29
Then we need to melt the ice...