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 first need to calculate the number of moles of each substance present.
1. Calculate the number of moles of water:
Using the molar mass of water (H2O) = 18 g/mol, we can calculate the moles of water:
moles of water = mass of water / molar mass of water
= 36 g / 18 g/mol
= 2 moles
2. Calculate the number of moles of glycerine (C3H5(OH)3):
Using the molar mass of glycerine (C3H5(OH)3) = 92 g/mol, we can calculate the moles of glycerine:
moles of glycerine = mass of glycerine / molar mass of glycerine
= 46 g / 92 g/mol
= 0.5 moles
The total moles of substances in the solution = moles of water + moles of glycerine = 2 + 0.5 = 2.5 moles
3. Calculate the mole fraction of each substance:
Mole fraction = moles of a substance / total moles of all substances
Mole fraction of water = moles of water / total moles of all substances
= 2 / 2.5
= 0.8
Mole fraction of glycerine = moles of glycerine / total moles of all substances
= 0.5 / 2.5
= 0.2
Therefore, in the given solution, the mole fraction of water is 0.8 and the mole fraction of glycerine is 0.2.