A student heats a sample of hydrate once, and the mass of the sample and the eva

Question

A student heats a sample of hydrate once, and the mass of the sample and the evaporating dish is 15.946 g. After a second heating cycle, the mass of the sample and the dish is 13.284 g. The student stops the heat/cool/weigh cycle after the second time. If the original mass of the evaporating dish and the hydrate was 21.8 g, and the mass of the evaporating dish alone was 1.756 g, what is the mass of water removed from the sample by heating? Provide your response to three digits after the decimal.

Explanation / Answer

The original mass of whole system 21.8g

after first and second heat cycle weight of whole system is 15.946 and 13.284

so after first cycle the mass of dish and sample is 15.946

so the water removed is

21.8 - 15.946 = 5.854

now in second cycle the mass of whole system is 13.284

So the removed water is

15.946 - 13.284 = 2.662g

so total water removed is

5.854 + 2.662 = 8.516g

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