How to solve this chemistry stoichiometry sum? A compund has O=61.32%,S=11.15%,H=4.88% and Zn=22.65%.The relative molecular mass of the compound is 287 a.m.u.Find the molecular formula of the...

How to solve this chemistry stoichiometry sum?

A compund has O=61.32%,S=11.15%,H=4.88% and Zn=22.65%.The relative molecular mass of the compound is 287 a.m.u.Find the molecular formula of the compound,assuming that all the hydrogen is present as water of crystallisation.

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Lets assume the compound to be `Zn_xS_yO_z*nH_2O` ` `

Let us say we have 100g of the compound.

Then;

Mass of S = 11.15g

Mass of O = 61.32g

Mass of H = 4.88g

Mass of Zn = 22.65g

 

Molic weights;

S = 32g/mol

O = 16g/mol

H = 1g/mol

Zn = 65g/mol

 

It is given that all the hydrogen in the compound is retain as water.

H moles present `= 4.88/1 = 4.88`

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