00:02
Hi there.
00:03
In this question, we are given the mass of silicon dioxide, and we are asked to convert that to moles.
00:10
So anytime we are converting from mass to moles, or for that matter, from moles to mass, we need to use the molar mass.
00:22
And the molar mass is the mass of one mole of the substance in grams.
00:26
And we determine molar mass from the periodic table.
00:29
So, for example, if i have one mole of sio2, i can determine its mass by looking at the mass of one silicon plus the mass of two oxygens from the periodic table and adding those all together.
00:46
This gives me a mass of 60 .08 grams of sio2.
00:55
Okay, so now we have any quality that's going to allow us to convert from our grams to moles.
01:01
Let's go ahead and set this up and solve it.
01:04
We have 54 .0 grams of si02...