1.0 x 1021
6.6 x 1021
2.0 x 1022
1.0 x 1022
5.4 x 1023
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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