00:01
For this problem, we have 5 .10 kilograms of water.
00:06
And there's a reaction that's being submerged in this 5 .1 kilograms of water in this water bath.
00:13
And that temperature starts at 31 .5 degrees celsius.
00:17
And it says that during the reaction, 135 kilojoules of heat flows out of the water bath and into that flask where that reaction is occurring.
00:27
So the water bath is losing heat.
00:30
That means its temperature is going to decrease.
00:33
So we need to know what tf is.
00:37
That's what they're asking us to find here.
00:39
But we know that it has to be less than 31 .5 degrees celsius.
00:46
Ok, so we're going to plug this into our q equation.
00:51
Q is heat, 135 kilojoules.
00:54
And our mass needs to be in grams.
00:56
So i'm going to take this times 1000.
00:59
And that would give us 5100 grams.
01:03
Our specific heat is 4 .18 joules per gram degree celsius.
01:10
And then we're looking for this change in temperature.
01:13
So we'll go ahead and solve this.
01:15
So we'll take 135 divided by 5100 divided by 4 .18.
01:21
And that tells us our change in temperature will be point, not very much there, 0 .0063 degrees celsius.
01:34
And so that means that we are going to take 31 .5 minus 0 .0063.
01:44
31 .5 minus 0 .0063...