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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 Calcium [Ca] in Calcium carbonate [CaCO3]
 
Hint      

2.

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

3.

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

4.

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

5.

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

6.

Percentage of Carbon [C] in Potassium bicarbonate [KHCO3]
 
Hint      

7.

Percentage of Hydrogen [H] in Sodium hydroxide [NaOH]
 
Hint      


 
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