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Question

Calculate the number of atoms of Mg and S in MgS if their ratio by mass is 3:4

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Solution

Hi,
Atomic mass of Mg =

24

Atomic mass of S = 32

Ratio of Mg and S in

Magnesium sulphide = 24:32 = 3:4

Mass ratio / Atomic mass of Magnesium (Mg) =

3/24 = 1/8

Mass ratio / Atomic mass of Sulphur

(S) = 4/32 = 1/8

Hence, ratio of atoms in Magnesium sulphide (MgS) =1 : 1.

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