1-What is the molality of a sodium chloride solution, if 7.73 g of NaCl are diss
ID: 103864 • Letter: 1
Question
1-What is the molality of a sodium chloride solution, if 7.73 g of NaCl are dissolved in 0.600 kg of water?
2-What is the mole fraction of a lithium fluoride solution prepared by dissolving 22.4 g of LiF in 0.100 kg of water
3-What is the mass percent of a lithium fluoride in a solution prepared by dissolving 29.2 g of LiF in 0.600 kg of water. 4-Calculate the freezing point for a 0.88 m solution of CCl4 in benzene.
5-Calculate the increase in the boiling point,T, for a 0.86 m solution of sucrose (dissolves as a molecule) in water.
Explanation / Answer
1)
Molar mass of NaCl = 1*MM(Na) + 1*MM(Cl)
= 1*22.99 + 1*35.45
= 58.44 g/mol
mass of NaCl = 7.73 g
we have below equation to be used:
number of mol of NaCl,
n = mass of NaCl/molar mass of NaCl
=(7.73 g)/(58.44 g/mol)
= 0.1323 mol
mass of solvent = 0.600 Kg
we have below equation to be used:
Molality,
m = number of mol / mass of solvent in Kg
=(0.1323 mol)/(0.6 Kg)
= 0.2205 molal
Answer: 0.220 molal
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