Question

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Answer 1

Answer:

1 mole has 6.022 × 10^23 particles in it.

mass of 1 mole of oxygen = 32g

or mass of 6.022 × 10^23 oxygen molecule = 32g

mass of 1 oxygen molecule = 32 ÷ (6.022 × 10^23) = 32/6.022 × 10^(-23) g = 5.314 × 10^(-23) g

mass of 10^20 oxygen molecules = 5.314 × 10^(-23) × 10^20 = 5.314×10^(-3) g

Answer 2

Solutions :-

$We\:know\:that$

$1\:mole = 6.022\:\times\:10^{23} \:particles .$

$Mass\:of\:1\:mole\:of\:oxygen = 32g$

$Mass\:of\:1\:mole\:of\:partcle = Mass\:of\:6.022\:\time\:10^{23}\:oxygen\:molecule = 32g$

$Now ,$

$Mass\:of\:1\:oxygen\:molecule = \frac{32}{(6.022\:\times\:10^{23} }$

$=>\frac{32}{6.022\:\times\:10^{23} } </p><p></p><p></p><p>[tex]Mass\:of\:10^{20}\:oxygen\:molecules = Mass\:of 1\:oxygen\:molecule\:\times\:10^{20}$

=> 5.314$=> 5.314\:\times\:10^{-23} \:\times\:10^{20} =>5.314\:\times\:10^{3}  g$10^{-23} g[/tex]

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