00:01
So we want to calculate the vapor pressure of an aqueous solution with nacl.
00:06
So first of all, nacl is an electrolyte, which means if it completely disassociates, it will have two times particles per molecule added into solution.
00:17
That will factor in later when we start to calculate our molar ratio for h2o.
00:24
But first off, let's write our equation for the vapor pressure of a solution.
00:28
So that is equal to our molar ratio.
00:30
Of h2o times the pressure of pure h2o at the specific temperature, 25 degrees celsius.
00:38
So first step is we are told we have a 5 .5 % by mass of nacl in the solution.
00:46
Now that's just another way of saying we could have 5 .5 grams of nacl per 100 grams total mass.
00:55
So if we had 5 .5 grams of nacl, let's calculate our moles...