00:01
Given the ratio of our oxygen and metal atoms on our surface, we can say that we are going to oxidize half of the metal surface, which means that the oxygen molecules must encounter half of an atom on the surface.
00:17
This will become, pardon me, this will become very important when we start doing calculations.
00:23
We are going to be using this equation.
00:26
We're going to say that j sub n is equivalent to p times n a divided by two pi times r times m times t raised to the one half j sub n is the number of molecules that is striking our surface p is our pressure n a is simply abrogadro's number t is our temperature in kelvin and m is our molar weight of oxygen so now what we're going to do is we're going to say that our pressure is 10 to the negative second pascals.
01:04
So now we can do a calculation.
01:06
We're going to get that j sub n is equivalent to 10 raised to the negative second pascales.
01:12
We're going to multiply it by avragadro's number 6 .02 times 10 to the 23rd.
01:19
We'll divide that by 2 pi times our molar mass 32 times 10 to the negative 3 kilograms per mole, multiplied by r, which is just a constant, 8 .314, multiplied by our temperature, 298 kelvin, and then we'll raise this entire quantity that i've denoted in brackets to the one -half power.
01:44
When we do that, we'll get the j -sub -n is equivalent to 6 .023 times 10 to the 21st, divided by 22 .31...