00:01
In this question, we're given nitric acid.
00:03
It's density and molarity.
00:04
We're asked to find the mass percent concentration for this particular malarity.
00:08
Now, this question seems hard because you're not given a volume.
00:11
You don't know how much you're working with.
00:13
But it really doesn't matter because if you have one mililiter of nitric acid or a liter or a thousand liters, they're all going to have the same concentration, the same malaria, same mass percent, the same density.
00:22
So let's start with the molarity.
00:25
16 molar means that if i have one liter, so let's start with that assumption.
00:29
We're going to assume that we have one liter.
00:34
If we have one liter, that means we have 16 moles of hno3.
00:39
Our mass percent requires me to work in grams.
00:46
So i'm going to change moles of hno3 to grams of hno3 using the molar mass of nitric acid.
00:53
If you look that up, it's 63 .01 grams for every one mole of hn .03.
01:03
And so if in this one liter of nitric acid, we're going to have a thousand and eight .16 grams of hn .03...