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A student determined the percentage of water in a hydrate to be 26 percent by weighing the sample, heating it until dry, and then reweighing it. The accepted value for the percentage of water in the hydrate is 45 percent. Which of the following is the best explanation for the difference between measured and accepted values?

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A student determined the percentage of water in a hydrate to be 26 percent by weighing the sample, heating it until dry, and then reweighing it. The accepted value for the percentage of water in the hydrate is 45 percent. Which of the following is the best explanation for the difference between measured and accepted values?






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