How many pounds of high test hypochlorite (HTH) are needed to make exactly 500 gal of a 10.0% HTH solution?

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Multiple Choice

How many pounds of high test hypochlorite (HTH) are needed to make exactly 500 gal of a 10.0% HTH solution?

Explanation:
Percent by weight means the mass of the solute is a fraction of the total solution mass. To get the amount of HTH, multiply the total solution mass by 0.10. Estimate the solution’s total mass using density close to water, about 8.34 lb per gallon. So total mass ≈ 500 × 8.34 = 4,170 lb. Ten percent of that is 0.10 × 4,170 = 417 lb of HTH. Thus, about 417 pounds of HTH are needed.

Percent by weight means the mass of the solute is a fraction of the total solution mass. To get the amount of HTH, multiply the total solution mass by 0.10.

Estimate the solution’s total mass using density close to water, about 8.34 lb per gallon. So total mass ≈ 500 × 8.34 = 4,170 lb. Ten percent of that is 0.10 × 4,170 = 417 lb of HTH.

Thus, about 417 pounds of HTH are needed.

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