Question

Write down the concentration of each of the following solutions in g/L and mol/L.

1) 7.3g HCl in 100ml solution

Answer 1

Given: Volume of solution = 100ml =0.1L, Mass of Solute in gram =7.3g

Molecular Formula = HCL

Molecular mass of HCl = 1+35.5=36.5 m

Mass of HCL in Mole (mol)

= Mass of HCL in gram(g)/ Molecular mass(m) = 7.3/36.5 =0.2 mol

Concentration of HCl (g/L)

=Mass of solute (g)/Volume(L) = 7.3g/0.1L = 73 g/L

Concentration of HCL (mol/L)

=Mass of HCL in moles/Volume of HCl in L = 0.2mol/0.1L = 2 mol/L

Answer is 73 g/L & 2 mol/L