Calculate the mass of solute present in each of the following solutions:
a. a** 10 cm3 of MnCl2 with a concentration of 1.5 mol dm-3
b. b** 25 cm3 of KI with a concentration of 0.020 mol dm-3
c. c** 2.000 dm3 of CH3COONa, where [CH3COONa] = 0.010 mol dm-3