00:01
Osmotic pressure is calculated using the equation osmotic pressure is equal to molarity times rt.
00:08
Molarity can be calculated by taking the mass of the solute, 5 .60 grams, and converting it into moles by dividing by its molar mass.
00:20
One mole is 180 grams.
00:22
We then divide all of that by the milliliters of the solution, 60 milliliters, sorry, by the liters of solution, 60 milliliters is 0 .060 liters.
00:35
We then multiply that by r, 0 .08206 liter atmospheres per kelvin mole.
00:43
And then the kelvin temperature, 25 degrees celsius is 298 kelvin.
00:49
Then all the units cancel except for atmospheres, and we get osmotic pressure in units of atmospheres.
00:58
5 .6 divided by 180 divided by 0 .06 multiplied by 0 .08206 multiplied by 298 gives us 12 .7 atmospheres.
01:16
For the next question, when a certain solution is administered to a patient's body, the fluid volume of the patient is increased without a fluid shift.
01:37
What type of tonicity is exhibited in the solution? the fluid that enters the body needs to eventually enter the cells.
01:49
If we have flow of water into the cells, this refers to hypotonicity.
01:58
They don't have an answer of hypotonicity, but i believe that is the correct answer.
02:03
So i suspect that they're referring to hypotonic instead.
02:11
Then for the next answer, find the mass of the non -electrolyte required to make 250 milliliters with an osmotic pressure of 600 millimeters of mercury.
02:23
So again we're going to use this equation but now we're going to solve for molarity.
02:30
Molarity will be equal to osmotic pressure divided by rt.
02:35
Osmotic pressure is the 600 millimeters of mercury which we convert to atmospheres knowing one atm is 760 millimeters of mercury.
02:49
We divide that by r 0 .08206 liter atmospheres per kelvin mole and the kelvin temperature 25 degrees celsius is 298 kelvin...