calculate the number of molecules in 56g of nitrogen gas
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= 2 * 14 = 28 u
Mass of nitrogen gas = 56 gm.
So the number of moles = 56 / 28
= 2moles
Now,
The number of molecules
= 2 moles * 6.022 * 10^23
= 12.044 * 10^23 molecules
molecules in 28g=6.022×10^23
molecules in 1 g=6.022×10^23/28
molecules in 56g= 6.022×10^23/28×56
=6.022×10^23×2
=12.044×10^23
So no. of molecules in 56g of Nitrogen gas is 12.044×10^23