00:01
So we have been given mass percentage and that is 35 % by mass.
00:06
So 35 % by mass means that 35 gram of solute that is acetone is dissolved in 100 gram.
00:51
Of solution so from here we have mass of solute we have mass of solution so now mass of solvent can be calculated as mass of solution is equal to mass of solute plus solvent so so now mass of solvent is equal to mass of solution minus solute.
02:16
So this will be 100 minus 35 gram.
02:27
So that is 65 gram now we have to calculate mole fraction to calculate mole fraction it is the method to determine the concentration of solution and it is the ratio of the given number of moles for the component divided by total number of moles of the component present in the solution so first of all let us calculate the number of moles for each solute and solvent so number of moles for acetone acetone is solute here and water is solvent here so for acetone i am using a subscript n is the symbol for number of moles and that will be equal to mass of the given component that is mass of acetone divided by a molar mass of given component that is molar mass of acetone so now putting the values this will be 35 gram divided by 12 multiplied by 3 c we have the molecular formula c3 h6 o and what we are doing that we are putting the atomic masses so some of atomic mass will give the molar mass so this is 12 multiplied by 3 plus 1 that is atomic mass of hydrogen multiplied by 6 plus atomic mass of oxygen that is 16.
04:24
So this will be number of moles of acetone is equal to 35 divided by 58 that gives 0 .603 mole.
04:41
So these are the number of moles.
04:47
Similarly, number of moles of water given by mass of water divided by molar mass of water.
04:57
So that will be mass of water that is solvent is 65 gram divided by molar mass of water.
05:08
That will be the formula of water is h2o.
05:12
So it will be 2 multiplied by 1...