00:02
Hi there.
00:03
In this question, we are asked to calculate the concentration of this solution in terms of moles per liter.
00:14
So what that would be is moles of the solute per liter of solution.
00:22
And that is the formula or the units for molarity.
00:27
So really we're trying to calculate the molarity of the solution.
00:32
Okay.
00:33
So as we look at this, as it's written, we're told that we have 69 .6 moles.
00:39
Of the n .a.
00:43
N .03.
00:44
And we're putting that into a 200 milliliter flask that we then fill with water.
00:51
Well, as written, this question actually doesn't make much sense because 69 .6 moles, that's very close to about, that's really close to six kilograms of sodium nitrate.
01:04
Six kilograms of sodium nitrate are not going to fit in a 200 milliliter flask.
01:09
So i am pretty sure that this unit mole is a typo, and they meant to have grams there.
01:21
All right.
01:21
So what i'm going to do, i'm going to work this question first for the way it's written, and then i'm going to repeat it with 69 .6 grams of nan03, because that makes for a more reasonable problem, a more believable problem.
01:40
All right, but let me work the first one first.
01:42
So we want moles per liter according to the directions.
01:46
So the only thing we need to convert is the denominator.
01:48
It's in milliliters right now.
01:50
We need to convert that to liters.
01:52
There are 1 ,000 milliliters in every liter.
01:56
I wanted the milliliters in the numerator, so it would cancel...