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

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Multiple choice | Fill in the blanks | Match the Columns

Your Performance

1.
Percentage of Oxygen [O] in Magnesium oxide [MgO]

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2.
Percentage of Oxygen [O] in Calcium carbonate [CaCO₃]

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3.
Percentage of Oxygen [O] in Potassium bicarbonate [KHCO₃]

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4.
Percentage of Oxygen [O] in Ferric oxide [Fe₂O₃]

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5.
Percentage of Sulfur [S] in Sulfur dioxide [SO₂]

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6.
Percentage of Carbon [C] in Calcium carbonate [CaCO₃]

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7.
Percentage of Magnesium [Mg] in Magnesium sulfate [MgSO₄]

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