00:03
So in this problem, we are solving for the final temperature, given that the mass of our starting amount of water in the water bath is 7 .50 kilograms.
00:14
Our initial temperature is 21 .7 degrees celsius.
00:21
And the energy that is going to flow from the flask into the water bath is 121 kilojoules.
00:29
And we know our specific heat value of water is 4 .18 joules.
00:34
Per gram degrees celsius.
00:37
So the first thing we need to do in order to solve for our final temperature is to get our units so they match that of those that are in our specific heat.
00:49
So our mass should be in grams, not kilograms.
00:52
So we'll do this conversion first.
00:56
We know that there are 1 ,000 grams and 1 kilogram.
01:04
So we'll set up that dimensional analysis, multiply across the top, divide by the bottom.
01:13
And to make sure we're writing our answer with the correct number of significant figures, so we don't get confused later on.
01:21
I'm going to write this answer in scientific notation.
01:26
So we have 7 .50 times 10 to the third grams.
01:32
And we also need to change our cue into jewels from kilojoules...