00:01
Hi there.
00:02
In this question, you are trying to use the ideal gas law, which is pv equals n -r -t to determine the number of moles, which is n.
00:11
So dividing both sides by rt to isolate n, we get n is equal to pv over rt.
00:23
So we need the values for p, v, r, and t.
00:33
Well, we are told that the r that we want to use is 0 .08206 liters times atmospheres over mole kelvin.
00:47
All right, so each of our other values needs to match up with the units in the universal gas constant.
00:54
For example, we're given a pressure of 947 tor, but we need to convert that to atmospheres.
01:03
So in one atmosphere, there are 760 tor.
01:11
Calculating this gives us 1 .25 atmospheres.
01:18
Okay, for the volume, we are given volume in milliliters, 15 .8 milliliters, but volume needs to be in liters.
01:29
So we need to convert from milliliters to liters.
01:32
We can do that because there are 1 ,000 milliliters in one liter.
01:36
This gives us 0 .0158 liters.
01:43
Temperature is given to us in the problem in degrees celsius.
01:49
Well, temperature needs to be in kelvin.
01:52
So to convert that, we need to add 273 .15.
01:56
That is how we convert from celsius to kelvin...