1.

Calculate the percentage composition of oxygen and hydrogen by taking the example of H_(2)O.

Answer»

Solution :`"Mass % of an ELEMENT"=("Mass of that element in the compound")/("Molar mass of the compound")xx100`
`"Now, Molar mass of "H_(2)O=2(1)+16=18g`
`"Mass % of HYDROGEN"=(2)/(18)xx100=11.11%`
`"Mass % of Oxygen"=(16)/(18)xx100=88.89%`


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