Question

K. Calculate number of atoms is each of
the following. (Average atomic mass :
N= 14 u, S = 32 u)
a. 0.4 mole of nitrogen
b. 1.6 g of sulfur


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Answer 1

Answer:

a. as 1 Mole of Nitrogen(N2) = 28gm

so, 0.4 mole = 28×0.4= 11.2gm

as 28gm contains 6.02×10^23

11.2 grams contain = (6.02×10^23/28) ×11.2=2.408×10^23 atoms.

b. as 32gm sulphur contain 6.02×10^23 atoms.

1.6 gm sulphur contain = (6.02×10^23/32)× 1.6= 0.301×10^23.

HOPE THE ANSWER IS CLEAR....