00:01
Problem 13 asks us to calculate the density of polonium, where in grams per cubic centimeter, where they've given us that the length is 334 picometers, and polodium crystallizes in a simple cubic arrangement.
00:18
So to calculate the density, we need to know its mass and its volume.
00:23
And so we'll start with its mass, where we're looking for the number of atoms, for goonium in one simple cube.
00:37
And so we know that there are eight atoms in this simple cubic arrangement, and that they take up one eighth of an atom is owned by this cube.
00:49
And so we know that eight atoms times one eighth, which equals one.
01:01
So i'll just cross this out.
01:04
Let's just erase it.
01:05
So we know that the whole unit is going to have one atom, one atom.
01:20
We know that the molar mass of plutium is 209 grams per mole, and we need to convert this just to grams.
01:34
And so to do that, we're going to use avogado's number, which tells us that there are 6 .0 to 2 times 10 to the 23rd...