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LuckyWell [14K]
3 years ago
10

Calculate the molarity of a solution obtained dissolving 10.0 g of cobalt(Ⅱ) bromide hexahydrate in enough water to make 450 mL

of solution 7.64 × 10-2 6.80 × 10-2 0.102 M 8.55 × 10-2 6.80 × 10-5
Chemistry
1 answer:
katovenus [111]3 years ago
8 0

Answer:

The molarity of this solution is 6.8 * 10^-2 M

Explanation:

<u>Step 1:</u> Data given

Mass of CoBr*6H2O = 10.0 grams

Molar mass of cobalt(Ⅱ) bromide hexahydrate =

Volume of the solution = 450 mL = 0.450 L

<u>Step 2:</u> Calculate moles of cobalt(Ⅱ) bromide hexahydrate

Number of moles = Mass / molar mass

Number of moles = 10.0 grams / 326.85 g/mol

Number of moles = 0.0306 moles

<u>Step 3:</u> Calculate molarity of the solution

Molarity = number of moles / volume

Molarity = 0.0306 moles / 0.450L

Molarity = 0.068 M = 6.8 * 10^-2 M

The molarity of this solution is 6.8 * 10^-2 M

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