Question

Calculate the number of atoms present in each of the sample?
(Atomic mass N = 14 O = 16)
42 g nitroge
1. 42 g Nitrogen
2. 80 g Oxygen
​

Answer 1

1. 6 mol Atoms of N

2. 10 mol atoms of O

Explanation:

mol = givenwt. / atomicwt.

(i)

mole(forN)= 42/14 =3

1 N2 molecule contains 2 atom of N

I moleN2 molecule contain 2 mol atoms of N

.

3 mole N2 molecule contain 6 mol atoms of N.

(ii)

mole(forO) =80/16 =5

1 o2 molecule conatin 2 O-atom

I mole 02 molecule contain 2 mol O-atom

5 mole 02 molecule contain 10 mol O-aton

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