1.

The number of molecules in 22.4 cm cube of Nitrogen gas at STP is

Answer»

1metre CUBE= 1000litres
or,1 LITRE = 10^-3 METRE cube=10^3 CENTIMETRE cube.

NOW,here
22.4litres of nitrogen gas at STP = 6.022 ×10^23 molecules of nitrogen gas
or,22.4×10^3 centimetre cube of nitrogen gas at STP= 6.022×10^23 molecules of nitrogen gas
or,1 centimetre cube of nitrogen gas at STP= 6.022×10^23/22.4×10^3 molecules of nitrogen gas
or,22.4centimetre cube of nitrogen gas at STP= 6.022×10^23×22.4/22.4×10^3 molecules of nitrogen gas
= 6.022×10^20 molecules of nitrogen gas



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