Question

15) The number of Na atom in 46 g Na (Atomic weight
of Na = 23) is
A) 6.023 x 1023
B) 2
C) 1
D) 12.046 x 1023​

Answer 1

Answer:d)12.046×10^23

Explanation:

First we have to find the no:of moles =weight in g /molecular weight

=46/23=2

Then see the no: of atoms ,,Na has only 1 atom

So no:of atom in 46 g is 2×1×avagadro no:NA

=2×6.023×10^23=12.046×10^23

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