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Find the simplest formula of a solid containing `A` and `B` atoms ia cubic arrangement In which `A` occuples corner and `B` the centre of the faces of unit cell. If the side length is `5 Å`, estimate the density of the solid assuming atomic weights of `A` and `B` as `60` and `90`, respectively. |
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Answer» Simplest formula `AB_(3), Mw = 60 + 3 xx90 = 330` Volume of unit cell `= (5 xx 10^(-8))^(3) = 125 xx 10^(-24) mL` One cell has one `AB_(3)`, molecule So volume of one mole `= 125 xx 10^(-24) xx 6.023 xx 10^(23)` `= 75.287 mL` Density `= (330)/(75.287) = 4.38g cm^(-3)` |
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