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What is the ppm concentration of 6.00 mL sample of solution that has 3.6 x 10-4 g of sodium ions?

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What is the ppm concentration of 6.00 mL sample of solution that has 3.6 x 10-4 g of sodium ions?

(a) 20

(b) 40

(c) 60

(d) 80

I have been asked this question in unit test.

I want to ask this question from Concentration-I topic in division Introductory Concepts of Chemical Process Calculation

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The correct choice is (c) 60

To explain: Concentration parts per million.

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