How many atoms are in 52.3 g of calcium ?

Explanation:

one mole contains Avogadro number of particles

So,

40g( the atomic mass) contains 6.023× 10^23 atoms.

so 1 g contains 40÷(6.023×10^23)

so, 52.3 g contains (40×52.3) ÷6.023×10^23

= 3.47× 10^-21

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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