Answer:
(a)
1 mole of oxygen atom = 16 g
0.2 mole of oxygen atom == 16 x 0.2 == 3.2 g
(b) 1 mol of Al == 27 g
4 mol of Al == 27x4 == 108
g.
(c) 1 mol of [23 x 2 + 32 +16
x 3] = 126 g
10 mol of = 126 x 10 = 1260 g.
(d) 1 mol Na + ions = 23 g
1.50 mol of Na+
ions == 23 x 1.50 = 34.5 g
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