The Molecular weight (MA) of N2O (laughing gas = 44 gm/mol.
Molecular
weight (MB) of (C10H5ClN2) (Tear gas) = 179 gm/mol.
(r1/r2)
= √{ (MB/MA) }
(r1/r2)
=√{ (179/44) }
(r1/r2)
= √4
(r1/r2)
= 2
Now
let s take “x” as the row from where student start laughing and weeping
simultaneously.
Therefore:
(X/30- x) = 2
x = 2(30-
x)
x = 60-2x
3x =
60
x = 20
Therefore,
from 20th row where students will start weeping and laughing
simultaneously.
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