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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 Potassium bicarbonate [KHCO3]

  40

  60

  70

  48

 
Hint      

2.

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

  30

  50

  2.5

  40

 
Hint      

3.

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

  20

  57.5

  60

  48

 
Hint      

4.

 Percentage of Oxygen [O] in Sulfur dioxide [SO2]

  12

  70

  50

  60

 
Hint      

5.

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

  39

  20

  2.5

  60

 
Hint      

6.

 Percentage of Potassium [K] in Potassium bicarbonate [KHCO3]

  39

  30

  2.5

  1

 
Hint      

7.

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

  57.5

  70

  60

  48

 
Hint      


 
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Percentage Composition of Chemical Compounds