00:02
Hi there.
00:03
In this question, we are trying to determine the concentration of the solution using the unit's molarity.
00:14
So molarity is defined as moles of the solute, which in this case is the kcl per liter of solution.
00:29
Okay, so as i just mentioned, the kcl is the solute.
00:34
So that is going to go in the numerator, 9 .3 grams of kcl.
00:39
The solution is 350 milliliters.
00:51
Okay, so this is a concentration because we have the solute in the solution, but it is not molarity because the units are not moles per liter.
01:04
What we need to do is to convert some units here so that we get moles in the numerator and liter in the denominator.
01:11
So let's go ahead and do that.
01:12
Let's start with the numerator, first of all, and we want to convert from gram.
01:17
To moles.
01:18
So anytime you're converting from grams to moles, you use molar mass.
01:23
And molar mass is the mass of one mole of the substance in grams.
01:28
And we get molar mass by looking at the periodic table and adding together the mass of each element in the compound.
01:35
So one potassium and one chloride...