Question

Calculate the number of gram atoms present in the following masses:-
i) 64g of oxygen
ii)140g of nitrogen​

Answer 1

Answer:

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1) 64gm of oxygen :-

no. of moles = given mass ÷ molecular mass.

=. 64÷ 32

=. 2 moles.

so, total atom of oxygen =(6.022×10^23 × 2) atom

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2) 140gm of Nitrogen:-

no. of moles :- given mass ÷ molecular mass.

= 140÷ 14

= 10 moles

so, total atom of nitrogen =(6.022×10^23× 10) atom.

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