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What is the concentration of a solution with 10 grams of calcium in 1000 m^3 of water?

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What is the concentration of a solution with 10 grams of calcium in 1000 m^3 of water?

(a) 150 ppm

(b) 250 ppm

(c) 800 ppm

(d) 1000 ppm

The question was posed to me in an online quiz.

My query is from Concentration topic in division Moles, Density & Concentration of Basic Chemical Engineering

1 Answer

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Correct answer is (b) 250 ppm

The explanation is: Moles of calcium = 10/40 =0.25, => concentration in ppm = (0.25/1000)*10^6 = 250 ppm.

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