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Concentration terms (molarity, molality, mole fraction, ppm) and dilution
JEE Main level
Single correct option
Difficulty 2 of 3
mc137
Concentrated sulphuric acid is 98%
H
X
2
SO
X
4
by mass with density
1.84
g
m
L
−
1
(
M
=
98
). Its molarity is
A
18.8
M
B
10.0
M
C
18.4
M
D
9.2
M
Answer: C
1000 mL has mass 1840 g, of which 98% = 1803.2 g is
H
X
2
SO
X
4
. Moles = 1803.2/98 = 18.4, so M = 18.4 mol/L.
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