Question

An aqueous solution contains 4.5 % NaCl by mass. calculate molality. calculate mole fraction

Answer #1

**4.5% NaCl by Mass means 4.5 g of NaCl in 100 g of
solution. (mass of solvent = 100 - 4.5 = 95.5 g)**

**molality = (mass/molarmass)*(1000/mass of solvent in
g)**

**
= (4.5/58.5)*(1000/95.5)**

**
= 0.805 m**

**moles of NaCl = 4.5/58.5 = 0.0769**

**moles of water = 95.5/18 = 5.305**

**molefraction of NaCl = moles of NaCl/total moles =
0.0769/(0.0769+5.305) = 0.0143**

**molefraction of water = 1- 0.0143 = 0.9857**

An aqueous solution contains 4.3% NaCl by mass.
Part A
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