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Question

What is the empirical formula of a compound that contains 0.05 mole of magnesium, 0.05 mole of sulfur, and 0.20 mole of oxygen?

A
MgSO
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B
MgSO2
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C
MgSO3
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D
MgSO4
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Solution

The correct option is D MgSO4
Ratio of the number of moles of Magnesium, Sulphur and Oxygen is 0.05 : 0.05 : 0.20 which is equal to 1 : 1 : 4

That is, for every atom of Magnesium there is one atom of Sulphur and four atoms of Oxygen.

Thus the emperical formula is MgSO4

Hence, the correct option is D

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