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A 15% (w/w) solution of BaCl2 in water has a density of 1.12 g/mL.
What is the concentration of the same solution expressed as molarity? How many moles of
chloride ions are in 25.0 mL of the BaCl2 solution?
Solution
Molarity = (% w/w x d x 10 / MW)
Molarity = (15 x 1.12 x 10 / 208.23)
Molarity = 0.807 M
moles = Molarity x V in L
moles = 0.807 x 25/1000
moles = 0.0202

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  • 1. A 15% (w/w) solution of BaCl2 in water has a density of 1.12 g/mL. What is the concentration of the same solution expressed as molarity? How many moles of chloride ions are in 25.0 mL of the BaCl2 solution? Solution Molarity = (% w/w x d x 10 / MW) Molarity = (15 x 1.12 x 10 / 208.23) Molarity = 0.807 M moles = Molarity x V in L moles = 0.807 x 25/1000 moles = 0.0202