The number of moles of oxygen in one litre of air containing 21% oxygen by volume in standard conditions is :
a)0.186 mole
b)0.21 mole
c)2.10 mole
d)0.0093 mole
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Answer:
_________----->>> b)0.21 mole
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Here is your answer ✌️❤️✌️❤️
O.21mole..
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