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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 Magnesium oxide [MgO]     Hint       257.5
Percentage of Sulfur [S] in Sulfur dioxide [SO2]     Hint       350
Percentage of Sodium [Na] in Sodium hydroxide [NaOH]     Hint       448
Percentage of Oxygen [O] in Potassium bicarbonate [KHCO3]     Hint       540


 
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