Calculate the number of moles of solute present in each of the following solutions:
a. 25 cm3 of HCl with a concentration of 0.010 mol dm-3
b. 5.2×10−2 dm3 of CuSO4 with a concentration of 0.010 mol dm-3
c. 100 cm3 of FeBr2 with a concentration of 2.5×10−5 mol dm-3