Question

An aqueous solution of nacl has a mole fraction of 0.21. What is the mass of NaCl dissolved in 100.0 mL of solution?
Don't I need the density of the solution. We can work out the numbers for 100.0 mL of SOLVENT without the density but not 100.0 mL SOLUTION.
. 21*58.4=12.3
1 molH2O-. 21=.79
.79*18=14.2gH2o

12.3:14.2=x:100
x=86.4

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