Some Basic Concepts of Chemistry · Question 33

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The molarity of a 70\% (mass/mass) aqueous solution of a monobasic acid (X) is 10-1 M (Nearest integer) [Given: Density of aqueous solution of (X) is 1.25 g mL-1 Molar mass of the acid is 70 g mol-1]

Answer

125

Solution

Take 100 g of solution: mass of acid = 70 g

Moles of acid = 7070 = 1 mol

Volume of solution = 100 g1.25 g mL-1 = 80 mL = 0.080 L

Molarity = 10.080 = 12.5 M = 125 10-1 M

Answer: 125

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