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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

Your Performance  

1.

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

  30

  48

  60

  40

 
Hint      

2.

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

  12

  39

  60

  48

 
Hint      

3.

Percentage of Magnesium [Mg] in Magnesium oxide [MgO]

  20

  60

  39

  48

 
Hint      

4.

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

  20

  40

  48

  12

 
Hint      

5.

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

  40

  12

  30

  2.5

 
Hint      

6.

Percentage of Calcium [Ca] in Calcium carbonate [CaCO3]

  1

  60

  40

  2.5

 
Hint      

7.

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

  39

  40

  12

  48

 
Hint      


 
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