Chemistry, 11th grade

Question

Hello,

my question:

20) If we want a solution containing 12 mol/l of HCl we must

- Dissolve 219 g HCl in 500 ml H2O

- Dissolve 50 g HCl in 114 ml H2O

- Dissolve 656 g HCl in 2 litres of water

Thank you in advance!

AA. sjcsckt

Answer 1

HCl has a molar mass calculated by:

H = 1.008 g/mol

Cl = 35.453 g/mol

-----------------------

36.461 g/mol

So for a) 219 g HCL/36.461 g/mol = 6 moles and 6 moles/0.5L = 12M or 12 mol/L so this is correct.

For b) 50 g HCL/36.461 g/mol = 1.37 moles and 1.37 moles/0.114L = 12M or 12 mol/L so this is also correct

For c) 656 g HCl/36.461 g/mol = 18 moles and 18 moles/2L = 9M or 9mol/L so this is NOT correct