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Percent composition and Chemical Formulas

Quiz by Olamide Akinnagbe

Grade 9-12
Science
Next Generation Science Standards

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10 questions
Show answers
  • Q1
    What is the percent composition of the compound formed when 2.70g of Aluminium combines with oxygen to form 5.10g of Aluminium oxide.
    60% Oxygen and 40 % Aluminium
    60% Aluminium and 40% oxygen
    53% Aluminium and 47% Oxygen
    53% Oxygen and 47% Aluminium
    30s
    HS-PS1-7
  • Q2
    Calculate the percent composition when 13.3g Fe combines completely with 5.7g Oxygen
    70% Fe and 30% Oxygen
    57% Oxygen and 43% Fe
    43% Oxygen and 57% Fe
    30% Fe and 70% Oxygen
    30s
    HS-PS1-7
  • Q3
    What is the percentage composition of Fe (Iron) in FeO
    68%
    52%
    22%
    78%
    30s
    HS-PS1-7
  • Q4
    What is the percentage composition of Mg(OH)₂
    40% Oxygen, 40% Magnesium and 20% Hydrogen
    50% Magnesium, 40% Oxygen and 10% Hydrogen
    3.4% Oxygen, 55.2% Magnesium and 41.4% Hydrogen
    41.4% Magnesium, 55.2% Oxygen and 3.4% Hydrogen
    30s
    HS-PS1-7
  • Q5
    Which of the following can be classified as an empirical formula
    C₆H₁₀O₄
    S₂Cl₂
    Na₂SO₃
    30s
    HS-PS1-7
  • Q6
    What is the empirical formula of C₆H₁₂O₆
    CH₂O
    C₃H₄O₃
    C₂H₃O₂
    CHO
    30s
    HS-PS1-7
  • Q7
    What is the Empirical formula of compounds with 42.9% C and 57.1% O
    C
    CO
    C₂O
    CO₂
    30s
    HS-PS1-7
  • Q8
    Determine the empirical formulas of a compound containing 71.72% Chlorine, 16.16 Oxygen and 12.12 Carbon
    Cl₂O₂C
    ClOC₂
    ClOC
    ClO₂C
    30s
    HS-PS1-7
  • Q9
    Determine the molecular formula of a compound with 94.1%Oxygen and 5.9% Hydrogen and a molar mass of 34g/mol
    H₂O₂
    HO₂
    HO₂
    H₂O
    30s
    HS-PS1-7
  • Q10
    Determine the molecular formula of a compound containing 50.7% Carbon, 4.2% Hydrogen and 45.1% Oxygen. The molar mass of the compound is 142 g/mol
    CHO₂
    C₆H₆O₄
    C₂H₂O
    C₂H₂O₂
    30s
    HS-PS1-7

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