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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]

  1

  40

  57.5

  2.5

 
Hint      

2.

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

  48

  1

  50

  70

 
Hint      

3.

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

  20

  48

  12

  50

 
Hint      

4.

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

  40

  48

  30

  60

 
Hint      

5.

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

  1

  12

  20

  48

 
Hint      

6.

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

  57.5

  39

  60

  70

 
Hint      

7.

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

  2.5

  70

  12

  40

 
Hint      


 
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