1.

0.24g sample of a compound of oxygen and boron was found by analysis to contain 0.144g of oxygen and 0.096g of boron. Calculate the percentage composition of the compound by weight. (AS-1)

Answer»

Solution :0.24 gm sample of COMPOUND of OXYGEN and boron
0.096 g of boron
0.144 gm of oxygen
0.250 gm
`0.25 -0.24 = 0.1`
`THEREFORE (0.1)/(0.25) xx 100 = (10)/(2cancel5) xx 10cancel0 = 40 %`
`0 * 24 to 0 * 144`
`(100 xx 0*144)/(0*24) = 60` %


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