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Concentration terms (molarity, molality, mole fraction, ppm) and dilution
JEE Main level
Single correct option
Difficulty 2 of 3
mc079
Concentrated sulfuric acid is
98%
H
X
2
SO
X
4
by mass with density
1.84
g/mL
. Taking
H
X
2
SO
X
4
=
98
g/mol
, its molarity is
A
9.2
M
B
10.0
M
C
1.80
M
D
18.4
M
Answer: D
1 L of acid weighs 1840 g and contains 0.98 x 1840 = 1803.2 g of
H
X
2
SO
X
4
= 18.4 mol. Molarity = 18.4 M.
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