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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 Sodium hydroxide [NaOH]

  48

  40

  30

  2.5

 
Hint      

2.

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

  70

  12

  48

  50

 
Hint      

3.

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

  30

  20

  70

  40

 
Hint      

4.

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

  39

  12

  20

  40

 
Hint      

5.

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

  48

  2.5

  57.5

  12

 
Hint      

6.

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

  70

  50

  2.5

  48

 
Hint      

7.

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

  2.5

  40

  20

  70

 
Hint      


 
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