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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 Sulfur [S] in Sulfur dioxide [SO2]
 
Hint      

3.

Percentage of Oxygen [O] in Sodium hydroxide [NaOH]
 
Hint      

4.

Percentage of Sodium [Na] in Sodium hydroxide [NaOH]
 
Hint      

5.

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

6.

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

7.

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


 
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