1) 0.2 moles of sodium chloride was dissolved in 250cm3 of water. Calculate the concentration in:
a) Moles per litre
Solution Step I
Remember 1 litre is equal to 1000cm3
0.1 moles is dissolved in 250cm3
X moles is dissolved in 1000cm3
Step II
cross multiply to solve for x
   
x = x 1000cm3
 = 250cm3
=moles/litre