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Question

A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with a Na2CO3 solution. This calcium carbonate is heated to convert all the calcium to calcium oxide and the final mass of the calcium oxide is 1.62 g. The percentage by mass of calcium chloride in the original mixture is:

A
15.2 %
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B
32.1 %
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C
21.8 %
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D
11.07 %
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Solution

The correct option is B 32.1 %
CaCl2+Na2CO3CaCO3+2NaCl
CaCO3CaO+CO2
Moles of CaCl2= Moles of CaCO3= moles of CaO=1.6256
Mass of CaCl2=1.6256×molar mass of CaCl2=1.6256×111g=3.21g
Percentage mass of CaCl2=3.2110×100=32.1%

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