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An 8.24 gram sample of a hydrated salt is heated until it has a constant mass of 6.20 grams. What was the percent by mass of water contained in the original sample

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maacastrobr

Answer:

32.9%

Explanation:

The mass of water present in the original sample can be calculated by the substraction:

  • m H₂O = sample mass before heating - sample mass after heating
  • m H₂O = 8.24 g - 6.20 g = 2.04 g

The percent by mass of water can be calculated with the formula:

  • Water Mass / Original Sample Mass * 100 %
  • [tex]\frac{2.04}{6.20}[/tex] * 100% = 32.9%

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