How many moles contain 9.75x10^20 molecules of carbonic acid?

1 mole of carbonic acid=6.023×10^23 molecules

now

9.74×10^20molecules=

1/(6.023×10^23 molecules)×9.74×10^20molecules

=1.617×10^-3 mole

is your answer.

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the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be