Molarity =0.100mol∕0.250moldm3 =0.100mol∕0.250dm3 * 1000cm3∕dm3 =400cm3 Volume (V) = Amount ( n ) / Concentration (C) Given that the amount of HCl is 0.100 mol and the concentration of the solution is 0.250mol∕dm3, you can calculate the volume: Volume (V) =0.100mol∕0.250mol∕dm3=0.4dm3 Since 1dm3 is equal to 1000cm3, you can convert the volume from dm3 to cm3 : Volume (V) =0.4dm3×1000cm3∕dm3=400cm3 Therefore, the volume of 0.100 mol of HCl in a 0.250mol∕dm3 solution is 400cm3.