Mole Fraction

Q. In an experiment it is found that 2.0769g of pure x products 3.6769g of pure x2o5. Find the number of moles of x?

Q.

Densities of two gases are in the ratio 1 : 2 and their temperatures are in the ratio 2 : 1, then the ratio of their respective pressures is

1. 2 : 1

2. 4 : 1

3. 1:1

4. 1 : 2

Q. molarity of aqueous solution of glucose is 2.315 mol/L. mole fraction of glucose is

Q. One mole of a mixture of $N_2,N{O}_2$ and $N_2{O}_4$ has a mean molar mass of $\mathrm{55.4.}$ On heating to a temperature at which $N_2{O}_4$ is completely dissociated: $N_2{O}_4\to 2N{O}_2$, the mean molar mass tends to a lower value of $39.57$. What is the mole ratio of $N_2:N{O}_2:N_2{O}_4$ in the original mixture?

1. 0.4 : 0.2 : 0.4
2. 0.5 : 0.1 : 0.4
3. 0.6 : 0.2 : 0.2
4. 0.4 : 0.4 : 0.2

Q.

How to determine mole fraction of solvent when moles of solute and solvent are given?

1. 

2. 

3. 

4. 

Q. What are all the formulas of mole concept ? And when they should be used ? Among them explain the normality part and gram equivalent and gram equivalent weight and their interior meaning. Pleas

Q. 0. Mole fraction of solvent in aqueous solution of NaOH having molality of 3 is (1) 0.3 (2) 0.05 (3) 0.7 (4) 0.95

Q.

Calculate the molality of 12.5% w/w Sulphuric acid?

Q. A mixture of $O_2$ and gas "Y" (mol.wt.80) in the mole ratio $a:b$ has a mean molecular weight 40. What would be mean molecular weight, if the gases are mixed in the ratio $b:a$ under identical conditions? (gases are non-reacting):

1. 40
2. 48
3. 62
4. 72

Q. How many moles present in 5600 ml of CO2 at STP.

Q.

Mole fractions of A and B in a mixture in which $6.023\times {10}^{23}$ molecules of A and $10.4\times {10}^{23}$ molecules of B are present.

1. 063, 0.37

2. 0.37, 0.37

3. 0.37, 0.63

4. 0.63, 0.63

Q. 20. Does mole fraction depend on temperature

Q.

Which one is heavier, 1 mole of ${\mathrm{CO}}_2$ or 1 mole of $\mathrm{CO}$?

Q. 22 The mole fraction of the solute in one molal aqueous solution is 1)0.027 2)0.036 3)0.018 4)0.009

Q. 49. What is the mole fraction of solute in 0.2 molal aqueous solution of urea? \lbrack(H2N)2CO 60\rbrack(1) 0.003(2) 0.02(3) 0.3(4) 0.03

Q. Calculate the mole fraction of 30% by mass benzene in a solution with carbon tetrachloride.

1. 0.542
2. 0.458
3. 0.518
4. 0.324

Q. The mole fraction of a solute in a 1 m aqueous solution is:

Q. Mole fraction of solvent in aqueous solution of NaOH having molality equal to 4 is a-0.99 b- 0.75 c-0.93 d-0.05

Q. A sugar syrup (214.2 g) contains 34.2 g sugar. Calculate molality of solution and mole fraction of each component.

Q. what is the relationship between molality and mole fraction?

Q. A sugar syrup (containing sugar and water only) of weight 214.2 g contains 34.2 g of sugar ($C_{12}{H}_{22}{O}_{11}$). Find the mole fraction of the sugar in the syrup.

1. $0.1\times {10}^{-2}$
2. $9.9\times {10}^{-3}$
3. $9.9\times {10}^{-4}$
4. $0.1\times {10}^{-3}$

Q. A solution is made with Solvent A (molar mass 40 g/mol) by slowly adding solute B. A curve is plotted between molality of the solution vs $\frac{x_B}{x_A}$ where $x_B$ and $x_A$ represents the mole fraction of solute and solvent respectively.
Calculate the slope of the curve.

1. 10 mol/g
2. 10 g/mol
3. 25 g/mol
4. 25 mol/g

Q. 68. Mole fraction of A vapours above solution in mixture of A and B where XA=0.4 pA=100mm and pB=200mm

Q. the mole fraction of glucose in (aq sol.) is 0.2, then molality of sol. will be?

Q. 37. Find mole fraction of urea in 11.11 molal aqueous solution

Q. 42. How to calculate the moles

Q. Mole fraction of solute in aqueous solution of 30%NAOH is(1) 0.16(2) 0.05(3) 0.25(4) 0.95

Q. The relationship between molality (m) and mole fraction $\left({\chi }_A\right)$ of the solvent is:

1. $m=\frac{1-XA}{XA}\times \frac{1000}{M_A}$
2. $m=\frac{XA}{1-XA}\times \frac{1000}{X_A}$
3. $m=\frac{XA}{1-XA}\times \frac{1000}{XB}$
4. $m=\frac{1-X_A}{XA}\times \frac{1000}{XB}$

Q. What is the mole fraction of the solute in a 1.00 molal aqueous solution?

1. 0.0354
2. 0.0177
3. 0.177
4. 1.77

Q.

How to determine mole fraction of solvent when moles of solute and solvent are given?

1. $\frac{\text{Moles of solute}}{\text{Moles of solvent}}$

2. $\frac{\text{Moles of solute}}{\text{Moles of solution}}$

3. $\frac{\text{Moles of solute}}{\text{Moles of solute+ Moles of solvent}}$

4. $\frac{\text{Moles of solvent}}{\text{Moles of solute+Moles of solvent}}$