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 Oxygen [O] in Sodium hydroxide [NaOH]	Hint Hint	1	57.5

Percentage of Oxygen [O] in Ferric oxide [Fe₂O₃]	Hint	2	40

Percentage of Sulfur [S] in Sulfur dioxide [SO₂]	Hint	3	1

Percentage of Sodium [Na] in Sodium hydroxide [NaOH]	Hint	4	30

Percentage of Hydrogen [H] in Potassium bicarbonate [KHCO₃]	Hint	5	50

58 more pages in Chemistry Quiz Activities