1.

Find the mass of oxygen contained in 1 kg of potassium nitrate (KNO_(3)) .

Answer»

Solution :Since 1 molecule of `KNO_(3)` contains 3 atoms of oxygen , 1 MOL of `KNO_(3)` contains 3 mol of oxygen atoms .
`therefore` MOLES of oxygen atoms = `3 xx ` moles of `KNO_(3)`
`= 3 xx (1000)/(101) = 29.7` (MOLECULAR mass of `KNO_(3) = 101`)
`therefore` mass of oxygen = number of moles `xx` atomic mass = `29.7 xx 16 G = 475 . 2 g `


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