Question 1

What is the percent composition of the compound formed when 2.70g of Aluminium combines with oxygen to form 5.10g  of Aluminium oxide.

Accepted Answer

53% Aluminium and 47% Oxygen

Answer

60% Oxygen and 40 % Aluminium

Answer

60% Aluminium and 40% oxygen

Answer

53% Oxygen and 47% Aluminium

Question 2

Calculate the percent composition when 13.3g Fe combines completely with 5.7g Oxygen

Accepted Answer

70% Fe and 30% Oxygen

Answer

57% Oxygen and 43% Fe

Answer

43% Oxygen and 57% Fe

Answer

30% Fe and 70% Oxygen

Question 3

What is the percentage composition of Fe (Iron) in FeO

Accepted Answer

78%

Answer

68%

Answer

52%

Answer

22%

Question 4

What is the percentage composition of Mg(OH)₂

Accepted Answer

41.4% Magnesium, 55.2% Oxygen and 3.4% Hydrogen

Answer

40% Oxygen, 40% Magnesium and 20% Hydrogen

Answer

50% Magnesium, 40% Oxygen and 10% Hydrogen

Answer

3.4% Oxygen, 55.2% Magnesium and 41.4% Hydrogen

Question 5

Which of the following can be classified as an empirical formula

Accepted Answer

Na₂SO₃

Answer

C₆H₁₀O₄

Answer

S₂Cl₂

Question 6

What is the empirical formula of C₆H₁₂O₆

Accepted Answer

CH₂O

Answer

C₃H₄O₃

Answer

C₂H₃O₂

Answer

CHO

Question 7

What is the Empirical formula of compounds with 42.9% C and 57.1% O

Accepted Answer

CO

Answer

C

Answer

C₂O

Answer

CO₂

Question 8

Determine the empirical formulas of a compound containing 71.72% Chlorine, 16.16 Oxygen and 12.12 Carbon

Accepted Answer

ClOC

Answer

Cl₂O₂C

Answer

ClOC₂

Answer

ClO₂C

Question 9

Determine the molecular formula of a compound with 94.1%Oxygen and 5.9% Hydrogen and a molar mass of 34g/mol

Accepted Answer

H₂O₂

Answer

HO₂

Answer

HO₂

Answer

H₂O

Question 10

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

Accepted Answer

C₆H₆O₄

Answer

CHO₂

Answer

C₂H₂O

Answer

C₂H₂O₂

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