JAMB - Chemistry (1981 - No. 42)
If one mole of aluminium contains 6 x 1023 atoms of aluminium, how many atoms are contained in 0.9g of aluminium?
(Al = 27)
(Al = 27)
1.0 x 1021
6.6 x 1021
2.0 x 1022
1.0 x 1022
5.4 x 1023
ব্যাখ্যা
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
0.9 gms of Al will contain (6 x 1023 x 0 g)/(27 1) = 0.2 x 1023 or 1022