Question

How many g of water are required to be mixed with 11.75 g of HgCl in order to make a 0.01 m solution? (Refer to the periodic table for atomic weights.)

40 g

5,000 g

2 x 106 g

2 x 108 g

Answer 1

Molar mass HgCl = 200.59+35.453 = 236.043g/mo;
11.75g = 11.75/236.043 = 0.04977 = 0.05mol HgCl
If you mix this with 1000g H2O you will have 0.05m solutiuon
You want a 0.01m solution: mix with 0.05/0.01*1000 = 5,000g H2O