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# Calculating moles and determining percent random error

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3 years ago
 Calculating moles and determining percent random error 1) A student collects the following data in order to find the chemical formula of a Copper sulfate hydrate.  A 1.104 gram sample of unknown hydrate loses 0.3983 grams of water when heated.  Reaction with aluminum produces 0.2810 grams of copper metal. The remaining mass must have been sulfate ion (SO4-2).  Find the moles of water, the moles of copper and the moles of sulfate ion in the sample. Then give the chemical formula for the copper sulfate hydrate.        I know that a mole is 6.022 x10^23, but I'm not sure how to calculate the above questions. 2) Assuming the unknown hydrate in problem #1 was weighed using a balance     that is accurate to the nearest milligram (± 0.001 grams), what is the percent random error for that measurement? Read 442 times 4 Replies
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Laser_3Laser_3
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3 years ago
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