5g of NaCl is dissolved in 1000g of water If the density of the resulting solution is 0 997 - Chemistry - Some Basic Concepts of Chemistry

Question

5g of NaCl is dissolved in 1000g of water If the density of the
resulting solution is 0 997 g/cm3, find the molarity and molality
of solution

Muskan Patel · Answer

molecular mass of NaCl=23*1+35 5*1
=58 5g/mol
molality=mass of solute*1000/molecular mass*mass of solvent(in
g)
=5*1000/58 5*1000
0854m
weight of solution=weight of solvent+weight of solute
=1000+5
=1005g
1 liter=1000ml=1cm cube
density=mass/volume
997=1005/volume
volume=1005/ 997
=1008 02 l
molarity=mass of solute in g/molecular mass*volume of solution in
l
=5/58 5*1008 02
=5/58969 17
=8 479M

5g of NaCl is dissolved in 1000g of water. If the density of the resulting solution is 0.997 g/cm3, find the molarity and molality of solution.