A 20.0-g sample of HF is dissolved in enough water to give 2.0*10^2ml of solution.?

Question

The concentration of solution is
a. 1.0M
b. 3.0M
c. 0.10M
d. 5.0M
e. 10.0M

Answer 1

actually a chemistry question but here are the steps you need:


20.0 g HF x (1 mol HF / molar mass HF) = moles HF

(Moles HF / 200 mL) = moles per mL

moles per mL x (1000 mL / 1 L) = concentration


I came out with an answer of 5.0M = d

Answer 2

Oops! Molecular weight of HF is 20 g (not 10g) so 20 g is 1mole; dissolved in water to make 200ml : gives solution strength of 20 g / 20g x 1000ml per litre / 200ml = 5 moles per litre or 5.0 molar solution or 5.0M