Question

Q.12 One atom ofan element 'M' weights 6.643 x 10-23 g. Then moles of 'M' in 4 kg of sample is
(1) 10 NA (2) 100 NA (3) 10
(4) 100
1.
1.
1
.1.
11​

Answer 1

Answer:

100 approx.

Explanation:

wt. of 1 atom of element= 6.643×10^-23 g

wt. of 1 mole of atoms =

6.643 ×10^-23 × 6.022 × 10^23= 40.004g

= 40g (approx.)

no.of moles of 4kg or 4000 g sample

= 4000 ÷ 40. = 100 moles