00:01
Hi, so the formula for molar ep is moles of solute over volume of the solution in terms of liters.
00:17
And then since we're solving for the concentration of chromium cation, we have to calculate first the number of moles of chromium cation from the given two solutions.
00:28
So we'll start from the chromium chloride solution, we have moles of cr2 plus from crcl2.
00:38
If we have 0 .461 molar, this is moles of crcl2 per liter solution multiplied by the volume, which is 39 .8 ml.
00:50
We have to convert the ml to liters here.
00:53
1000 ml is 1 liter.
00:55
And then we have to convert this to moles of chromium cation.
01:02
For every 1 mole of crcl2, we have 1 mole of chromium cation also.
01:12
So we'll write cr2 plus in the numerator.
01:15
We'll cancel some units, ml, liters, moles of crcl2.
01:19
Then we have here the remaining unit, moles of chromium cation.
01:23
So this will give us 0 .01835 moles of cr2 plus.
01:32
Now from the second solution, chromium iodide, this is cri2.
01:42
We have 0 .586.
01:45
This is moles of cri2 per liter solution multiplied by the volume, 13 .8 ml.
01:53
Convert the ml to liters.
01:55
1000 ml is 1 liter.
01:58
And for every 1 mole of cri2, we have 1 mole of chromium cation also...