00:03
Hi there.
00:04
In this question, we have a couple of equalities that were given right off the start because we are given the molarity of the solution.
00:12
And molarity means moles per liter.
00:15
Therefore, the 0 .76 molar means that there are 0 .76 moles of the calcium nitrate in every liter of solution.
00:33
Okay.
00:34
Another thing we have here, since we are working with just the nitrate ions, we need to look at the formula.
00:41
Here.
00:43
And we see that in the formula for every mole of calcium nitrate that we have, there are two moles of nitrate.
01:00
We notice that because of that subscript of two outside parentheses.
01:05
So we have two nitrates for every mole of calcium nitrate.
01:09
All right.
01:10
And we are given, or we want exactly 0 .5 moles of nitrate.
01:17
So that is our goal.
01:18
So that's what we want to start with.
01:20
In our dimensional analysis.
01:27
And based upon this, we can use our second equality here to convert to moles of calcium nitrate.
01:35
So we get two moles of nitrate ions.
01:40
I want that in the denominator, so it will cancel for every mole of the calcium nitrate.
01:51
Okay, so moles of nitrate cancel.
01:53
Now we're at moles of calcium nitrate, and we're trying to get towards a volume...