1.

A sample of clay is found to have the formula Al_(2)O_(3).K_(2)O.6SiO_(2) . Calculate the percentage of alumina (Al_(2)O_(3)), potassium oxide (K_(2)O) and silica (SiO_(2)) in the sample.

Answer»


Solution :`"MOL. mass of "Al_(2)O_(3).K_(2)O.SiO_(2)=(2xx27+3xx16)=(2xx39+19)+6(28+2xx16)`
`=102+94+360=556`
`%" of "Al_(2)O_(3)=(102)/(556)xx100=18.35%, %" of "K_(2)O=(94)/(556)xx100=16.90%","%" of "SiO_(2)=(360)/(556)xx100=64`


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