Question

Which of the following has the largest number of atoms ?
(A) 0.284 g Cl2
(B) 0.1 g H2SO4
(C) 1.17 g NaCl
(D) 0.001 mol Na3PO4
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Answer 1

0.5g atom(mole) of Cu=0.5×6.023×10

23

=3.011×10

23

Cu atoms

(b) 0.635g of Cu=

63.5

0.635

×6.023×10

23

=6.023×10

21

Cu atoms

(c) 0.25 moles of Cu=0.25×6.023×10

23

=1.5×10

23

Cu atoms

(d) 1g of Cu=

63.5

1

×6.023×10

23

=9.48×10

21

Cu atoms

Thus, 0.5g atom of Cu has maximum number of Cu atoms.