Question

Calculate the number of gram atoms present in the following masses:-
i) 64g of oxygen
ii)140g of nitrogen​

Answer 1

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11th

Chemistry

Structure of Atom

Discovery of Subatomic Particles

Calculate the following, pr...

CHEMISTRY

Calculate the following, present in 16 g of O2.

(a) The number of moles (b) Number of molecules

(c) Number of gram atoms(d) Number of atoms

(e) volume occupied by it at S.T.P.(f) Number of protons.

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ANSWER

 Molecular weight of oxygen is 32.

Thus the number of moles present in 16 g of O2 will be 0.5

Number of molecules present will be 0.5NA

Number of gram atoms will be 0.5×2NA=NA( Since one molecule of oxygen contains 2 atoms of oxygen)

1 mol of a gas occupies 22.4l at STP, thus given sample will occupy 11.2l at STP.

No. of protons=No.of gram atoms×8=8NA(Since one oxygen atom contains 8 protons)

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Answer 2

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