Help ME!!!!!

[phxfirebird]

A 20.0-g sample of HF is dissolved in enough water to give 2.0 x 10(2) mL of solution. The concentration of the solution is?[/i]

[peter]

A 20.0-g sample of HF is dissolved in enough water to give 2.0 x 10(2) mL of solution. The concentration of the solution is?[/i]

First calculate number of moles of HF: n(HF) = m(HF) / M(HF) = 20.0 g / 20.0 (g/mol) = 1 mol
Then calculate molarity of that solution = n(HF) / V = 1 mol / 0.2 L = 5 M