Question

How many moles are present in 12 grams of oxygen gas.

Answer 1

no. of moles =

$given \: mass \div molar \: mass$

given mass = 12

molar mass of O2= 18

$12 \div 18 = 0.6$ answer = 0.6 moles

Answer 2

HØLÁ ...❤

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Molar mass of $O_2$ = 2 × 16

=> 32 g

32 g contains 1 mole of $O_2$

1 g = $\frac{1}{32}$

12 g of $O_2$ = $\frac{12}{32}$

=> 0.375 mole

Hence, answer is 0.375 mole.