00:01
Here in this problem we have to calculate the number of grams of water that is needed to dissolve 25 .31 grams of kno3 in order to prepare 0 .1982 molar solution.
00:15
First we'll find out number of moles of kno3.
00:25
And that will be the mass of kno3 given here, 25 .31 grams divided by the molar mass of kno3, which is 1 .30, which is 1 .303, which is 1 .3 ,000.
00:36
101 .1032 grams per mole.
00:41
And we have 0 .2503 moles.
00:47
Now, we have to find out the number of grams of water that is needed to dissolve 25 .31 grams of kno3 in order to prepare 0 .1982 molal solution.
01:05
Now what is molality? let's write that.
01:10
Morality, that is number of moles of the salute...