1.

Mass of the following "element" // "compound" is given in grams. Calculate it.s moles and number of "molecules"//"atoms" : 8 g oxygen (O_(2))

Answer»

Solution :Number of moles of 8 g OXYGEN = `("mass of oxygen")/("molecular mass of oxygen")`
`=(8)/(32)`
= 0.25 mole
Number of MOLECULES in 8G oxygen `(O_(2)) = "Number of moles of "O_(2) xx "AVOGADRO number"`
`= 0.25" mole" xx 6.023 xx 10^(23) "molecules" // "mole"`
`= 1.506 xx 10^(23)` molecules


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