Question

10 gram sample of a mixture of cacl2 and NACL is treated to precipitate all the calcium as calcium carbonate this calcium carbonate is heated to convert all the calcium to calcium oxide and final mass of calcium oxide as 1.68 gram the percent by mass of cacl2 in original mixture is

Answer 1

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here is your answer

CaCO3 +heat--->CaO +Co2

X gms               1.68gms

100                   56

[molecular mass of CaCO3=100u

molecular mass of CaO=56u]

cross multiply through the equation and solve for x grams of caco3

x=1.62x100/56

=2.89g

Cacl2 +Na2Co3 --->Caco3 +2 Nacl

x                             2.89g

111                         100

Again cross multiply through the equation and solve for x grams of Cacl2

x=2.89x 111/100

=3.2g

%CaCl2 in original mixture 3.2grams

Cacl2 over 10gms mixture is 32%

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