Question

convert into mole. 16gm of oxygen gas​

Answer 1

HERE IT GOES

Mass of one oxygen atom = 16gm

therefore 16gm of oxygen has one mole.

=>16gm = 1mole

=> 1gm = 1/16 mole

=> 64 gm = 1/16 x 64 mole

=> 64 gm mole = 4 mole

thus 16 gm of oxygen contains 4 moles.

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Answer 2

we know in one molecule of oxygen there are 2 atom. Hence in 0.5 mole of oxygen molecule, there are 0.5 * 2 mole of atom of oxygen. that is 1 mole of oxygen atom. Number of particle in one mole = 6.022 * 10^233.