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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 Magnesium [Mg] in Magnesium sulfate [MgSO4]     Hint       140
Percentage of Sodium [Na] in Sodium hydroxide [NaOH]     Hint       270
Percentage of Iron [Fe] in Ferric oxide [Fe2O3]     Hint       357.5
Percentage of Sulfur [S] in Sulfur dioxide [SO2]     Hint       420
Percentage of Oxygen [O] in Sodium hydroxide [NaOH]     Hint       550


 
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