Answer:
(a)
No. of moles of sodium
We know that one mole of sodium contains 6.022X 1023 atoms.
2 moles of sodium contain =
2 x 6.022 x 1023 atoms = 1.204 x1024
atoms
(b) 1 mole of oxygen = 32 g
32 of
contains 6.022 x 1023
molecules
8 g ot contains molecules
= 3.011 x 1023 molecules
(c) 1 mole of carbon atoms contains 6.022 X 1023
atoms
0.1 mole of carbon atoms
contains = 6.022 x 1023 x 0.1
= 6.022 x 1022 atoms of carbon
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