Question

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Answer 1

To Calculate Mass of Na with Same atoms as 4 gm of Ca.

Atomic mass of Na=23 and Ca=40

Therefore, Molecular wt. of Na=23 gm and Ca=40 gm.

BY AVOGADRO'S LAW:

40 g of Ca contains 6.023 x 10^23 atoms.

4 g of Ca contains    'x' atoms.

x=(4 x 6.023 x 10^23)/40.

x=6.023 x 10^22 atoms.

Therefore, 4 gm of Ca has 6.023 x 10^22 atoms.

Again, BY AVOGADRO'S LAW

23 g of Na has 6.023 x 10^23 atoms at STP.

'x' gm of Na has 6.023 x 10^22 atoms. (Since, 4 gm of Calcium has 6.023 x 10^22 atoms.)

x=(23 x 6.023 x 10^22) / 6.023 x 10^23.

x=2.3 g

Therefore, Mass Of Sodium Na is 2.3 g