1.

Mass of the following "element" // "compound" is given in grams. Calculate it.s moles and number of "molecules"//"atoms" : 9 g aluminium (Al)

Answer»

Solution :Number of MOLES of 9 g aluminium = `("mass of aluminium")/("atomic mass of aluminium")`
`=(9)/(27)` = `(1)/(3)` mole
Number of ATOMS in 9g aluminium (Al) = `"Number of moles of Al" xx "Avogadro number"`
`=(1)/(3)" mole" xx 6.023 xx 10^(23) "MOLECULES" // "mole"`
`~~ 2.008 xx 10^(23)` molecules


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