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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 Calcium carbonate [CaCO3]

  40

  30

  12

  48

 
Hint      

2.

Percentage of Oxygen [O] in Potassium bicarbonate [KHCO3]

  50

  48

  57.5

  70

 
Hint      

3.

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

  39

  12

  40

  50

 
Hint      

4.

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

  39

  20

  40

  12

 
Hint      

5.

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

  2.5

  20

  30

  40

 
Hint      

6.

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

  2.5

  50

  12

  30

 
Hint      

7.

Percentage of Hydrogen [H] in Potassium bicarbonate [KHCO3]

  12

  50

  1

  30

 
Hint      


 
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