Different solutions of salt X are made up. What volume of: a) a 4 mol/dm³ solution contains 2 moles of X? b) a 6 mol/dm³ solution contains 0.03 moles of X?

a. 0.5dm³

b. 5x10⁻³dm³

Explanation:

a. A solution that is 4mol/dm³ contains 4 moles in 1dm³. The volume that contains 2 moles is:

2 moles * (1dm³ / 4mol) =

0.5dm³

b. And for the 6 mol/dm³ containing 0.03moles:

0.03 moles * (1dm³ / 6mol) =

5x10⁻³dm³

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