How many molecules are there in 14g of nitrogen gas at s....
How many molecules are there in 14g of nitrogen gas at s.t.p? (n = 14, Avogadro Number = 6. 0 x 1023mol-1)
1.2 x 10 23
3.0 x 1023
6.0 x1023
1.2 x 1024
30 x1023
Correct answer is B
mass of nitrogen gas = 14g, molar mass of nitrogen gas = 28gmol-1
mole = massmolarmass=noofparticlesavogadro′sno
moles = 1428=noofparticles6.0×1023
no of molecules = 0.5 x 6.0 x 1023
= 3.0 x 1023molecules.
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