Determine The Mole Fraction Of Substances In Solution Containing 36g of water and 46g of glaycerine C3H5(OH)3.
Get first the number of moles (n) of each species. To get the moles, divide the mass by the molar mass. To get the molar mass, get a periodic table and add the individual mass of the elements in the chemical formula.
H2O (water): 2*1 + 1*16 = 18 g/mol
C3H8O3 (glycerine): 3*12 + 8*1 + 3*16 = 92 g/mol
Therefore,
n,H2O = 36 / 18 = 2 mol H2O
n,C3H8O3 = 46 / 92 = 0.5 mol C3H8O3
To get the molar fraction of each, get the total moles, and divide each moles by the total:
Total moles = 2.5 moles
molar fraction, H2O = 2/2.5 = 0.8
molar fraction, C3H8O3 = 0.5/2.5 = 0.2
Hope this helps :3
To determine the mole fraction of substances in a solution, we need to know the moles of each component and the total moles in the solution.
First, let's calculate the moles of water (H2O) and glycerine (C3H5(OH)3) in the solution:
Molar mass of water (H2O) = 2(1.01 g/mol of H) + 16.00 g/mol of O = 18.02 g/mol
Moles of water = mass of water / molar mass of water = 36 g / 18.02 g/mol = 1.999 mol (approx. 2 mol)
Molar mass of glycerine (C3H5(OH)3) = 3(12.01 g/mol of C) + 8(1.01 g/mol of H) + 3(16.00 g/mol of O) = 92.09 g/mol
Moles of glycerine = mass of glycerine / molar mass of glycerine = 46 g / 92.09 g/mol = 0.500 mol (approx. 0.5 mol)
The total moles in the solution will be the sum of the moles of water and glycerine:
Total moles = 2 mol + 0.5 mol = 2.5 mol
Now, let's calculate the mole fraction of each substance:
Mole fraction of water = moles of water / total moles = 2 mol / 2.5 mol = 0.8
Mole fraction of glycerine = moles of glycerine / total moles = 0.5 mol / 2.5 mol = 0.2
Therefore, the mole fraction of water in the solution is 0.8, and the mole fraction of glycerine is 0.2.