What is the percent mass/volume and molarity of sodium chloride solution, if 2.0grams of salt is collected by evaporating from 30.0ml of sodium chloride solution?

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18-04-2015
Chemistry

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What is the percent mass/volume and molarity of sodium chloride solution, if 2.0grams of salt is collected by evaporating from 30.0ml of sodium chloride solution?

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imen imen · Answer 1 · 2015-04-18T12:09:56-04:00

imen imen

18-04-2015

M(NaCl)=M(Na)+M(Cl)
=23+35
=58 g/mol
n=m/M n=c.v ρ=m/v
m=2g v=30ml=0.03l
molarity of sodium chloride is:
n=m/M
=2/58
=3.4.10(-2)mol
the percent mass/volume is:
ρ=2/0.03
=2/3 10^2 g/l

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