MolSynapse
question bank
All chapters
NEET
JEE
Practice
MolSynapse
/
Question bank
/
Mole Concept
/
Concentration terms (molarity, molality, mole fraction, ppm) and dilution
JEE Main level
Numerical answer
Difficulty 2 of 3
mc142
An aqueous urea solution (
M
=
60
) is 2.0 molal and has density
1.03
g
m
L
−
1
. Find its molarity in
mol
L
−
1
, to two decimal places.
Numerical answer type, answer in mol/L, tolerance 0.01.
Answer: 1.84 mol/L
Take 1 kg of solvent: urea = 2.0 mol = 120 g, solution mass = 1120 g, volume = 1120/1.03 = 1087.4 mL. Molarity = 2.0/1.0874 L = 1.84 M.
Practice Mole Concept
More on Concentration terms (molarity, molality, mole fraction, ppm) and dilution
Previous question
Next question
More questions on Concentration terms (molarity, molality, mole fraction, ppm) and dilution
A water sample of mass 2.4 kg contains 5.5 mg of dissolved lead. Express the lead concentration in ppm by mass, to two decimal places.
JEE Main level
A solution is made from 23 g of ethanol (C2H5OH, M=46) and 90 g of water (M=18). Find the mole fraction of ethanol multiplied by 100, to two...
JEE Main level
To 100 mL of 0.6 M NaCl solution, water is added until the molarity becomes 0.25 M. Assuming volumes are additive, how many mL of water must...
JEE Main level
Which of the following concentration terms do not change with temperature for a given aqueous solution (ignore evaporation)?
JEE Main level
The mole fraction of the solute in a 2.0 molal aqueous solution is (H2O=18)
JEE Advanced level
A commercial nitric acid is 68% HNO3 by mass with density 1.41 g mL^-1 (M=63). The volume of this acid needed to prepare 500 mL of 0.50 M HN...
JEE Advanced level