# Question 1 Sam records the mass of his evaporating dish as 5.483 g...

## Question

Question 1
Sam records the mass of his evaporating dish as 5.483 g.
He records the mass of the evaporating dish and the sample of hydrate as
16.554 g.
After heating the sample in the evaporating dish to constant weight, the mass of them combined is 14.903 g.
How many moles of water were removed from the sample by the heating process?

Question 2
A student is told the theoretical mass % water in her sample is 66.698 %. She obtains an experimental value of 46.847 % when she performs the lab activity. What is her % error?

Question 3
George determines the mass of his evaporating dish to be 4.261 g. He adds a solid sample to the evaporating dish, and the mass of them combined is 12.182 g. What must be the mass of his solid sample? Express your response to three digits after the decimal.

Question 4
A student heats a sample of hydrate once, and the mass of the sample and the evaporating dish is 17.157 g. After a second heating cycle, the mass of the sample and the dish is 14.668 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 20.069 g, and g. What must be the mass of his solid sample? Express your response to three digits after the decimal.

Question 5
An anhydrous (water removed) salt has a formula mass of 146.157 g/mol. If the hydrated version of the salt has 7 mol of water associated with it, what is the mass % of water in the hydrated salt? Report your answer to three digits after the decimal.

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1- 0.092 mole...

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