19 Calculate the number of proton incase of: -
(a) 16 gm of oxygen atom.
(b) 0.16 gm of oxygen atom.
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Explanation:
Molecular weight of oxygen is 32.
Thus the number of moles present in 16 g of O
2
will be 0.5
Number of molecules present will be 0.5N
A
Number of gram atoms will be 0.5×2N
A
=N
A
( 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=8N
A
(Since one oxygen atom contains 8 protons)
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