00:01
Hi there.
00:02
In this question, we start off with a mass of ammonium iodide.
00:06
So the first thing i want to do is write the formula for ammonium iodide.
00:10
It is nh4.
00:13
That is ammonium.
00:14
And ammonium has a one positive charge.
00:18
And it's with an iodide ion, which is simply i, and it has a one negative charge.
00:26
So the formula is nh4i.
00:29
If this were to be placed into water, so it's starting out as a solid, if we're going to put this into water, it would dissociate into the ions.
00:39
We would get nh4.
00:42
With that positive charge, it would be aquaous.
00:46
And we would get the iodide ion, which is also aquis.
00:52
So in other words, what this is showing us, and this is balanced now, this is showing us that for every one formula unit of nh4i, we get one nh4 ion.
01:03
So this is going to allow us to first determine the moles of the positive ion.
01:10
And the positive ion is the nh4.
01:14
So that's what we're interested in here is the nh4.
01:17
And then for moles, we can use a smaller mass to determine grams.
01:21
So let's go ahead and get started...