MCQ
The mole fraction of a solute in a $100$ molal aqueous solution .......... $\times 10^{-2}$
(Round off to the Nearest Integer).
[Given : Atomic masses : $H : 1.0 \,u , O : 16.0\, u ]$
- ✓$64$
- B$52$
- C$44$
- D$62$
✓
Answer
Correct option: A.
$64$
a
$100$ molal aqueous solution means there is $100$ mole solute in $1 kg =1000 gm$ water. Now,
$100$ molal aqueous solution means there is $100$ mole solute in $1 kg =1000 gm$ water. Now,
mole-fraction of solute $=\frac{ n _{\text {solute }}}{ n _{\text {solute }}+ n _{\text {solvent }}}$
$=\frac{100}{100+\frac{1000}{18}}=\frac{1800}{2800}=0.6428$
$=64.28 \times 10^{-2}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Treatment of waste water involves physical, chemical, and biological processes, which remove $ ........ $ matter that contaminates waste water.
→An organic compound containing carbon hydrogen and oxygen contains $52.20\%$ carbon and $13.04\%$ hydrogen. Vapour density of the compound is $23$. Its molecular formula will be
→If $W$ is mass number and $N$ is the atomic number of an element, then
→In aqueous solution the ionization constants for carbonic acid are
→$K_1 = 4.2 \times 10^{-7}$ and $K_2 = 4.8 \times 10^{-11}$
Select the correct statement for a saturated $0.034\, M$ solution of the carbonic acid.
$8\, mol$ of $AB_3(g)$ are introduced into a $1.0\, dm^3$ vessel. If it dissociates as $2AB_3(g) \rightleftharpoons A_2(g) + 3 B_2(g)$ At equilibrium, $2\,mol$ of $A_2$ are found to be present. The equilibrium constant of this reaction is
→The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in $\ce{[Be(OH)^4]^-}$ and the geometry of the complex are respectively.
→Mass percentage of $C, H$ and $O$ in a compound are $60\%$, $13.33\%$ and $26.67\%$ respectively. Molecular weight of the compound is $60$. The molecular formula of the compound is
→For which of the following parameters the structural isomers ${C_2}{H_5}OH$ and $C{H_3}OC{H_3}$ would be expected to have the same values ? (Assume ideal behaviour)
→The poisonous gas that comes out with petrol burning in a car is
Among the given structure which can exhibit tautomerism ?
