00:02
Hi there.
00:03
In this question, we are given an empirical formula.
00:07
And what an empirical formula is, is the formula that gives you the smallest whole number ratio for the atoms in a compound.
00:31
Okay, so it's just the ratio of the atoms or the elements in the compound.
00:38
It is not necessarily the actual formula of the molecule.
00:48
The actual formula for the molecule, known as the molecular, formula is the empirical formula raised to some whole number n.
01:09
In other words, it's some multiple of the empirical formula.
01:13
So what we need to do is find n.
01:15
So in this problem, we are given an empirical formula that is c5, h10, and s2.
01:29
So that's the empirical formula, and what we want to know is the molecular formula.
01:35
So we need to figure out what n is, so we know how many multiples of each of these atoms we have.
01:42
Well, the way that you calculate n is by taking the molecular weight or the molar mass of the compound.
01:56
This is the mass of the molecule and dividing it by the empirical formula mass, because the mass is going to be the mass of the molecule is going to be some multiple, some whole number multiple of that empirical formula mass.
02:17
So let's go ahead and calculate that.
02:18
The molecular weight we're given is 296 .54 grams per mole.
02:30
And what we need to calculate is the empirical formula mass...