20.0 mL of household bleach were diluted to 100.0 mL. The diluted solution was found to contain 0.0389 mol L^-1 of NaOCl.
What is the concentration NaOCl in the undiluted bleach?

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Express the concentration of 0.1945 mol L^-1 NaOCl in g/100 mL. M(NaOCl) = 74.5 g mol^-1.

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10.0 mL of a solution containing 3.5 g L^-1 Cl^- is diluted to 200.0 mL. The new concentration is:

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Convert 5.3 g L^-1 NaCl into mol L^-1. M(NaCl) = 58.5 g mol^-1.

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A 2.5 g sample of rock contains 1.8 g of ore. What is the percentage of ore in the rock?

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10.0 mL of a 72 ppm (parts per million) solution of Fe²⁺ was diluted to 500.0 mL. What is the new concentration?

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10.0 mL solution of Fe²⁺ was diluted to 500.0 mL. The diluted solution was found to contain 2.75 ppm of Fe²⁺. What was the original concentration?

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What is the concentration, in g L^-1, of a 0.104 mol L^-1 solution of KMnO₄? M(KMnO₄) = 158.0 g mol^-1.

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Convert 27.1 g L^-1 into % (g per 100 g).

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25.0 mL of a solution of hydrogen peroxide was diluted to 200.0 mL. The diluted solution was found to have a concentration of 1.54 mol L^-1. What is the concentration of the original solution?

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