MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptMolecular Formula

A compound was found in contain 21.67% Mg, 21.4% C and 57.0% O by mass of oxygen. What is the simplest formula of this compound ?

A.MgCO₃

B.MgC₂O₄✓ Correct

C.Mg₂CO₃

D.Mg(CO)₄

Explanation

Element Ma ss % Atomi c mass (g) mass % Atomic mass Integral ratio(divid e by smallest ratio) Mg 21.67 24 0.9 1 C 21.4 12 1.78 2 O 57.0 16 3.56 4 The compound has the general formula as, 1 2 4 2 4 Mg C O MgC O >> Thus, (b) is the correct option.

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