Chemistry Practice Test – Symbols, Formulae and Equations (Questions with Answers and Explanations)

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The empirical formula of a compound containing 0.067 mol Cu and 0.066 mol O is _____ [Cu = 63.5, O = 16.0]

(a) Cu2O   (b) CuO    (c) CuO2  (d) Cu2O2


Which of the symbols below represents 2 atoms of oxygen?

A. O   B. O2   C. 2O2   D. none of the above


An organic compound has the empirical formula CH2. If its molar mass is 42 g/mol, what is its molecular formula? [H = 1.0,  C = 12.0]

(a) C2H4   (b) C3H4    (c) C3H6    (d) C4H6


The molecular formula of a compound expresses the ______ 

(a) ratio of atoms of the different elements in one molecule.
(b) simplest whole number ratio for the atoms of different elements
(c) number of atoms in one molecule of a compound.
(d) number of atoms of the different elements in one molecule.


Vitamins C, which may or may not be effective in preventing colds is an organic compound containing carbon, hydrogen and oxygen. Analysis of a carefully purified sample gives C = 40.9%, H = 4.58%, O = 54.5%. From another experiment, the molar mass of vitamin C was found to be 180. From these data, determine the molecular formula of vitamin C.

A. C2H4O2       B. C3H4O3       C. C6H8O6       D. C2H2O2



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