Question

suppose a solution was prepared by dissolving 20.0g of sugar into 100g of water.calculate for the percentage by mass composition of solution?​

Answer 1

Answer:

The mole fraction is:

moles of target substance divided by total moles involved

The symbol for the mole fraction is the lower-case Greek letter chi, χ. You will often see it with a subscript: χsolute is an example.

Example #1: 0.100 mole of NaCl is dissolved into 100.0 grams of pure H2O. What is the mole fraction of NaCl?

Solution:

100.0 g / 18.0 g mol¯1 = 5.56 mol of H2O

Add that to the 0.100 mol of NaCl = 5.56 + 0.100 = 5.66 mol total

Mole fraction of NaCl = 0.100 mol / 5.66 mol = 0.018

What is the mole fraction of the H2O?

5.56 mol / 5.66 mol = 0.982