Question

What is the percent mass of Copper in each of the following compounds? a. CuSO4·5H2O b....

What is the percent mass of Copper in each of the following compounds?

a. CuSO4·5H2O

b. CuBr2

c. CuCl2∙2H2O

d. Cu(NO3)2∙3H2O

e. Cu(C2H3O2)2∙H2O

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Answer #1

a. CuSO4·5H2O

MW Cu = 63.5 g

MW of CuSO4 = 159.609

MW of H2O = 18

total MW = (159.609 + 18*5) = 249.609

% Cu = 63.5/249.609 * 100 = 25.3% is Copper

b. CuBr2

MW CuBr2 = 223.37

% Cu= 63.5/223.37 *100 = 28.42 %

c. CuCl2∙2H2O

MW of CuCl2*2H2O = (134.45 +2*18) =170.45

% Cu = 63.5/170.45 *100 = 37.2543%

d. Cu(NO3)2∙3H2O

MW of Salt hydrated = 187.56 + 3*18 = 241.56

%Cu = 63.5/241.56 * 100 = 26.287 %

e. Cu(C2H3O2)2∙H2O

MW of hydrate = 199.6493 +18 = 217.6493

%CU = 63.5/217.6493*100 = 29.175%

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