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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
Multiple choice | Fill in the blanks | Match the Columns

Your Performance  

Enter in the box the number corresponding to the right answer
Percentage of Hydrogen [H] in Sodium hydroxide [NaOH]     Hint       12.5
Percentage of Oxygen [O] in Ferric oxide [Fe2O3]     Hint       212
Percentage of Carbon [C] in Calcium carbonate [CaCO3]     Hint       339
Percentage of Potassium [K] in Potassium bicarbonate [KHCO3]     Hint       440
Percentage of Calcium [Ca] in Calcium carbonate [CaCO3]     Hint       530


 
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