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Chemistry : Percentage Composition of Chemical Compounds



What is the percentage of an element in each chemical compound whose formula is given below? Type only the number as your answer.
Given Atomic Weights:
H = 1 ; C = 12 ; N = 14 ; O = 16 ; Na = 23 ; Mg = 24 ; Al = 27 ; P = 31 ; S = 32 ;
Cl = 35.5 ; K = 39 ; Ca = 40; Cr = 52; Mn = 55 ; Fe = 56 ; Cu = 63.5 ; Zn = 65

Formats Info Page Quiz Review
Multiple choice | Fill in the blanks | Match the Columns

Your Performance  

1.

Percentage of Carbon [C] in Calcium carbonate [CaCO3]
 
Hint      

2.

Percentage of Magnesium [Mg] in Magnesium sulfate [MgSO4]
 
Hint      

3.

Percentage of Oxygen [O] in Magnesium oxide [MgO]
 
Hint      

4.

Percentage of Oxygen [O] in Calcium carbonate [CaCO3]
 
Hint      

5.

Percentage of Oxygen [O] in Ferric oxide [Fe2O3]
 
Hint      

6.

Percentage of Iron [Fe] in Ferric oxide [Fe2O3]
 
Hint      

7.

Percentage of Sulfur [S] in Sulfur dioxide [SO2]
 
Hint      


 
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