Mole ConceptHard
Question
A 10.0 g sample of a mixture of calcium chloride and sodium chloride is treated with Na2CO3 solution. This calcium carbonate is heated to convert all the calcium to calcium oxide and the final mass of calcium oxide is 1.62 gm. The percentage by mass of calcium chloride in the original mixture is -
Options
A.15.2%
B.32.1%
C.21.8%
D.11.07%
Solution
CaCl2 + Na2CO3 → CaCO3 + 2 NaCl
CaCO3
CaO + CO2
Mole of CaCl2 = mole of CaCO3 = mole of CaO =
Mass of CaCl2 =
Molar mass of CaCl2
=
× 111 gm.
% of CaCl2 =
× 100 = 32.1 %.
CaCO3
CaO + CO2 Mole of CaCl2 = mole of CaCO3 = mole of CaO =
Mass of CaCl2 =
Molar mass of CaCl2=
× 111 gm.% of CaCl2 =
× 100 = 32.1 %. Create a free account to view solution
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