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In lab, a student weighed out 1.636 g of unknown in a beaker. The student added 60 mL DI water and followed the protocol in the lab to filter and dry the product, which had a final mass of 0.522 g.The filtrate was tested, and the student determined that CaCl2•2H2O was the limiting reactant. Determine the percent by mass composition of CaCl2•2H2O in the original unknown sample.

Question

In lab, a student weighed out 1.636 g of unknown in a beaker. The student added 60 mL DI water and followed the protocol in the lab to filter and dry the product, which had a final mass of 0.522 g.

The filtrate was tested, and the student determined that CaCl2•2H2O was the limiting reactant. Determine the percent by mass composition of CaCl2•2H2O in the original unknown sample.

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Step 1

The percent mass composition is also known as the mass percent also called as the percent by weight. The sum of all the masses which are present in a reaction mixture should be added up to 100%.

Step 2

For a given experiment, the percent mass composition is same as calculating the percentage error.

In the given problem, the mass of the unknown sample as calculated by the student is found to be 1.636 g.

Step 3

After the addition of 60 mL of DI water by the student, the mass of the final dry product is found to be 0.522 ...

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