Which of the following sample has highest mass?
I)2 gm-atom of Na
II)4 gm-molecule of Nitrogen
III)22.4 lit of O2 at STP
IV)108 gm of Fe
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Answer:
W=
22.4
VolumeatS.T.P
×molecular weight
W=No. of moles×molecular weight
11.2 L of carbon dioxide at STP corresponds to
22.4
11.2
=0.5 moles and weighs 22 g.
1.5 gram moles of nitrogen weighs 42 g.
3.01×10
24
oxygen molecules corresponds to
6.02×10
23
3.01×10
24
=5 moles and weighs 160 g.
10 gram atoms of helium weighs 40 g.
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