If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)

A.

1.0 x 1021

B.

6.6 x 1021

C.

2.0 x 1022

D.

1.0 x 1022

E.

5.4 x 1023

View answer & explanation

Correct answer is C

1 Mole or 27 gms of Al contains 6 x 1021 atoms
0.9 gms of Al will contain (6 x 1023 x 0 g)/(27 1) = 0.2 x 1023 or 1022

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