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If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms ar...


Question

If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?

(Al = 27)

Options

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

The correct answer is C.

Explanation:

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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