Question

the percent by mass of metal M (Ar=24.3) in its metal chloride is 58.9%. what is the empirical formula of the metal chloride

Answer 1

it is so simple

mg=24 g           %of mass Mg=58.9    ==> 58.9/24=2.4

o=18 g                %of mass O=100-58.9=41.4 ===>41.4/16=2.5

and next step

mg=2.4/2.4=1

o=2.5/2.4=1(approx)

so empirical formula = (MgO)n

and n=mass E.f/M.M

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