Percentage composition of
Cu(OH)2
Example
Calculate the percentage by mass of each element in Cu(OH)2.
What is the mass of copper that is present in 400 grams of Cu(OH)2 ?
Since 65.13% of the mass of Cu(OH)2 is due to copper the mass of copper in 400 grams of Cu(OH)2 can be calculated by the equation below.
400 g X 65.13/100 = 260.52 grams
1) Calculate the percentage composition of aluminium sulphate Al2(SO4)3
2) Calculate the mass of aluminium in 400 grams of Al2(SO4)3
3) Calculate the mass of oxygen in 400 grams of Al2(SO4)3
4) Calculate the percentage composition of copper carbonate CuCO3
5) Calculate the mass of copper in 50 grams of CuCO3
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1) Calculate the percentage
composition of aluminium sulphate Al2(SO4)3
15.8%Al, 28.1%S, 56.1%O
2) Calculate the mass of
aluminium in 400 grams of Al2(SO4)3
(15.8/100 ) X 400 = 63.2 g
3) Calculate the mass of
oxygen in 400 grams of Al2(SO4)3
(56.1 /100) X 400 =224.4 g
4)
Calculate the percentage composition of copper carbonate CuCO3
51.4%Cu, 9.7%C, 38.9%O
5)
Calculate the mass of copper in 50 grams of CuCO3
(51.4/100) X 50 = 25.7 g