00:01
So the molar mass of na2 cro4 is 162 grams per mole and the mass is 12 .5.
00:07
So we can calculate the moles.
00:13
That's equal to 12 .5 grams.
00:16
That's the mass divided by the molar mass, 162 grams per mole.
00:22
So you can see that our grams will cancel.
00:23
We'll get moles.
00:24
We get 0 .0772 moles.
00:35
And we have the volume of the solution.
00:37
That's 550 millilitres.
00:42
That is 0 .550 liters.
00:47
So we can deduce the molarity, which is the moles of the solute, divided by the volume of the solution in liters.
00:53
So what we have is 0 .0772 moles divided by 0 .550 liters.
01:02
We get 0 .140 molar.
01:06
So the molarity of n .a2cro4 is 0 .140.
01:13
So next in point 1 .4, part b, we have the molarity of the solution for potassium bromide, 0 .275.
01:20
Molar and the volume of solution here is 150 mil...