00:02
There, in this question, we are told that we have oxygen gas.
00:06
So remember that is o2, which is diatomic.
00:10
So in other words, for every mole of o2, that subscript of two tells us there are two moles of oxygen, because we're trying to determine the number of oxygen atoms.
00:24
The other thing we're going to need here is avogadro's number.
00:27
Avogadro's number tells us the number of representative particles in one mole of anything.
00:32
So in one mole of oxygen, there would be 6 .02 times 10 to the 23rd.
00:39
That is avagadro's number atoms of oxygen.
00:45
Okay, so we can use these two equalities as conversion factors to calculate our answer.
00:50
Let's go ahead and set this up using dimensional analysis and see what our answer is.
00:55
So we have 2 .50 moles of the 02.
01:00
Using our first equality there as a conversion factor, we see that for every mole of 02, i want that in the denominator so that it will cancel.
01:10
We get two moles of oxygen.
01:14
All right...