Chemistry, 05.07.2019 11:30 julia158

Amixture of 60 mol % n-propylcyclohexane and 40 mol % n-propylbenzene is distilled through a simple distillation apparatus; assume that no fractionation occurs during the distillation. the boiling temperature is found to be 157 degrees celsius (760 torr) as the first small amount of distillate is collected. the standard vapor pressures of n-propylcyclohexane and n-propyl-benzene are known to be 769 torr and 725 torr, respectively, at 1567.3 degrees celsius. calculate the percentage of each of the two components in the first few drops of distillate.

Answers: 1

Show answers

Answers

A mixture of 60 mol % n-propyl cyclohexane and 40 mol % n-propylbenzene is distilled through a simple distillation apparatus; assume that no fractionation occurs during the distillation, the percentage of each of the two components in the first few drops of distillate are 0.61 and 0.39 respectively.

From the information given, the first thing to do is to determine the mole fraction of each substance.

$\mathbf{The \ mole \ fraction = \dfrac{mole \ percent }{100}}$

For n-propyl cyclohexane;

$\mathbf{The \ mole \ fraction \ is = \dfrac{60 }{100}}$

The mole fraction is = 0.60 mole

For n-propylbenzene;

$\mathbf{The \ mole \ fraction \ is = \dfrac{40 }{100}}$

The mole fraction is = 0.40 mole

By the use of Raoult's law, we can estimate the total vapor pressure of the solution as follows:

$\mathbf{P{total} = P^0_{cy} N_{cy} + P^0_{benz}N_{benz}}$

where;

$\mathbf{P^0_{cy} }$ = n-propylcyclohexane vapor pressure $\mathbf{N_{cy} }$ = n-propylcyclohexane mole fraction $\mathbf{P^0_{benz} }$ = n-propylbenzene vapor pressure $\mathbf{N_{benz} }$ = n-propylbenzene mole fraction

Replacing the values given in the question

$\mathbf{P{total} = (769 \ torr\times 0.6) +(725\ torr \times 0.4)}$

$\mathbf{P{total} = (461 \ torr) +(290 \ torr)}$

$\mathbf{P{total} = 751.4 \ torr}$

The percentage composition of each component can now be estimated as follows:

The percentage composition can be determined by finding the ratio of the vapor pressure of the component given by the total vapor pressure.

Percentage component of n-propyl cyclohexane is;

= $\mathbf{\dfrac{461.4}{751.4}}$

= 0.61

Percentage component of n-propylbenzene is;

= $\mathbf{\dfrac{290}{751.4}}$

= 0.39

Therefore, we can conclude that the percentage of each of the two components in the first few drops of distillate is 0.61 for n-propyl cyclohexane and 0.39 for n-propylbenzene

Learn more about percentage composition here:

link

Answer from: brinleychristofferse

61 mole % propylcyclohexane and 39 mole % propylbenzene

Explanation:

For convenience, let’s call propylcyclohexane Component 1 and propylbenzene Component 2.

According to Raoult’s Law,

$p_{1} = \chi_{1}p_{1}^{\circ}$ and

$p_{2} = \chi_{2}p_{2}^{\circ}$

where

p₁ and p₂ are the vapour pressures of the components above the solution

χ₁ and χ₂ are the mole \fractions of the components

p₁° and p₂° are the vapour pressures of the pure components.

So,

$p_{1} = 0.60 \times \text{769 torr} = \text{ 461 torr}$

$p_{2} = 0.40 \times \text{725 torr} = \text{ 290 torr}$

$p_{\text{tot}}$ = p₁ + p₂= 461 torr + 290 torr = 751 torr

∴ In the vapour

$\chi_{1} = \frac{p_{1}}{p_{\text{tot}} } = \frac{\text{461 torr} }{\text{751 torr}} = 0.61$

χ₂ = 1 – χ₁ = 1 - 0.61 = 0.39

Answer from: Quest

There are no metaphors.

Answer from: Quest

The correct answer should be a.
Iam stuck! me quick. i am doing a

Another question on Chemistry

Chemistry, 22.06.2019 13:10

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

Answers: 1

Answer

Chemistry, 22.06.2019 17:00

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Answers: 1

Answer

Chemistry, 22.06.2019 18:00

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.

Answers: 3

Answer

Chemistry, 23.06.2019 03:50

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products

Answers: 1

Answer

You know the right answer?

Amixture of 60 mol % n-propylcyclohexane and 40 mol % n-propylbenzene is distilled through a simple...

Questions