00:01
Molarity is the way of expressing concentration and it is solved as the ratio of the moles of the solute and the volume of the solution expressed in liters.
00:12
In this problem we're given with different concentrations of different solution and their volume and we want to find the mass of the solute present in them.
00:22
So the first one we're going to find first the moles.
00:26
So rearrange the equation for molarity and we get moles as molarity multiplied by the volume in liters.
00:36
The given to us for the first one is 1 .98 and the volume in liters we will convert 575 to liters and we get 0 .575.
00:48
Let's take note that 575 ml we convert that into liters by dividing by 1000 since 1000 ml is one liter.
01:00
For this we get the moles to be equal to 1 .1385.
01:09
To find the mass we'll just multiply the moles by the molar mass.
01:15
The molar mass is the sum of the atomic mass of all the atoms making up the compound.
01:19
So in this case that our compound is hno3 so we'll take the molar mass sum of the molar mass of each n and 3 oxygen.
01:29
Doing that gives us 63 grams per mole and so we will divide or rather we will multiply the given the moles that we obtained by the molar mass and doing that gives us the mass in grams as 71 .7.
01:54
We do the same for the others...