1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ikadub [295]
3 years ago
15

A mixture containing 20 mole % butane, 35 mole % pentane and rest

Chemistry
2 answers:
notka56 [123]3 years ago
8 0

Answer:

2.5 % butane, 42.2 % pentane and 55.3 % hexane

Explanation:

Hello,

In this case, the mass balance for each substance is given by:

Butane:z_bF=y_bD+x_bB\\\\Pentane: z_pF=y_pD+x_pB\\\\Hexane: z_hF=y_hD+x_hB

Whereas y accounts for the fractions at the outlet distillate and x for the fractions at the outlet bottoms. Moreover, with the 90 % recovery of butane, we can write:

0.9=\frac{y_bD}{z_bF}

So we can compute the product of the molar fraction of butane at the distillate by total distillate flow by assuming a 100-mol feed:

y_bD=0.9*z_bF=0.9*0.2*100mol=18mol

The total distillate flow:

y_bD=18mol\\\\D=\frac{18mol}{0.95} =18.95mol

And the total bottoms flow:

F=D+B\\\\B=F-D=100mol-18.95mol=81.05mol

Next, by using the mass balance of butane, we compute the molar fraction of butane at the bottoms:

x_b=\frac{z_bF-y_bD}{B} =\frac{0.2*100mol-18mol}{81.05} =0.025

Then, the molar fraction of pentane and hexane:

x_p=\frac{z_pF-y_pD}{B} =\frac{0.35*100mol-0.04*18.95mol}{81.05} =0.422

x_h=\frac{z_hF-y_hD}{B} =\frac{(1-0.2-0.35)*100mol-(1-0.95-0.04)*18.95mol}{81.05} =0.553

Therefore, the molar composition of the bottom product is 2.5 % butane, 42.2 % pentane and 55.3 % hexane.

NOTE: notice the result is independent of the value of the assumed feed, it means that no matter the basis, the compositions will be the same for the same recovery of butane at the feed, only the flows will change.

Regards.

Sliva [168]3 years ago
7 0

Answer:

The percentage composition of the Bottoms is

- 2.46% Butane.

- 42.25% Pentane.

- 55 29% Hexane.

Explanation:

The feed is eventually separated into distillate and bottoms at the end of the day.

If the total number of moles in the feed = F, and we assume an initial basis of 100 mol

Total number of moles in the distillate = D

Total number of moles in the bottoms = B

Since distillation is a physical separation technique, with no chemical reaction expected,

The overall balance of the system,

F = 100 = B + D (eqn 1)

In the feed, there is 20 mole% of butane, 35 mole% of pentane and the rest, that is, 45 mole% of hexane.

Butane = 0.20F moles = 0 2×100 = 20 moles

Pentane = 0.35F moles = 0.35×100 = 35 moles

Hexane = 0.45F moles = 0.45×100 = 45 moles

In the distillate, there is 95 mole% of butane, 4 mole% of pentane and the rest, that is, 1 mole% is hexane

Butane = 0.95D moles

Pentane = 0.04D moles

Hexane = 0.01D moles

The composition of the Bottoms isn't known.

But, it is given that the distillate is expected to contain 90% of the butane in the feed

Component balance for butane, based on this information

Butane in the distillate = 90% of butane in feed

0.95D = 90% × 0.20F = 0.18F

Butane in the distillate = 0.95D = 0.18F

D = 0.1895F = 0.1895 × 100 = 18.95 moles

The composition of the distillate can then be rewritten as

Butane = 0.95D moles = 0.95×18.95 = 18 0025 moles

Pentane = 0.04D moles = 0.04×18.95 = 0.758 moles

Hexane = 0.01D moles = 0.01×18.95 = 0.1895 moles

From the overall balance,

100 = B + D

B = 100 - D = 100 - 18.95 = 81.05 moles

Hence, the amount of each component in the Bottoms now will be the amount in the feed minus the amount in the distillate

Butane

20 - 18.0025 = 1.9975 moles

Percent compositon = (1.9975/81.05) = 0.0246 = 2.46%

Pentane

35 - 0.758 = 34.242 moles

Percent composition = (34.242/81.05) = 0.4225 = 42.25%

Hexane

45 - 0.1895 = 44.8105 moles

Percent composition = (44.8105/81.05) = 0.5529 = 55.29%

Please note that, irrespective of the assumed basis for the total number of moles in the feed, the molar composition of the bottoms obtained, remains the same.

Hope this Helps!

You might be interested in
Aqueous hydrobromic acid hbr will react with solid sodium hydroxide naoh to produce aqueous sodium bromide nabr and liquid water
Natalka [10]
 Balanced equation is

HBr + NaOH ----> NaBr + H2O

Using molar masses

80.912 g HBr reacts with  39.997 g of Naoh to give 18.007 g water

so 1 gram of NaOH reacts with 2.023 g of HBR   
and 5.7 reacts with 11.531 g HBr so we have excess HBr in this reaction

Mass  of water produced  =    (5.7 * 18.007 / 39.997  =  2.6 g to 2 sig figs
8 0
3 years ago
Read 2 more answers
Using the equations 2 Sr(s) + O₂ (g) → 2 SrO (s) ∆H° = -1184 kJ/mol SrO (s) + CO₂ (g) → SrCO₃ (s) ∆H° = -234 kJ/mol CO₂ (g) → C(
kkurt [141]

<u>Answer:</u> The \Delta H^o_{rxn} for the reaction is 72 kJ.

<u>Explanation:</u>

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The given chemical reaction follows:

2SrCO_3(s)\rightarrow 2Sr(s)+2C(s)+3O_2(g)      \Delta H^o_{rxn}=?

The intermediate balanced chemical reaction are:

(1) 2Sr(s)+O_2(g)\rightarrow 2SrO(s)    \Delta H_1=-1184kJ

(2) SrO(s)+CO_2(g)\rightarrow SrCO_3(s)     \Delta H_2=-234kJ      ( × 2)

(3) CO_2(g)\rightarrow C(s)+O_2(g)     \Delta H_3=394kJ    ( × 2)

The expression for enthalpy of the reaction follows:

\Delta H^o_{rxn}=[1\times (\Delta H_1)]+[2\times (-\Delta H_2)]+[2\times (\Delta H_3)]

Putting values in above equation, we get:

\Delta H^o_{rxn}=[(1\times (-1184))+(2\times -(-234))+(2\times (394))]=72kJ

Hence, the \Delta H^o_{rxn} for the reaction is 72 kJ.

4 0
3 years ago
Determine the mass fraction of iron in its compounds:
Shkiper50 [21]

Explanation:

We have a molecule composed of 3" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant: inherit; font-weight: normal; one; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">33 iron atoms, and 4" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; border: p; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">44 atoms of another element. We are given the following information: it has 2.36&#xA0;g" role="presentation" style="box-sizing: inherit; margin: 0px; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">2.36 g2.36 g of iron for 3.26&#xA0;g" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant: inherit; font-weight: -wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">3.26 g3.26 g of molecule.

I want to find the molar mass of the compound, I have tried so far:

m=3.26&#xA0;g=0.00326&#xA0;kg" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant: inherit; font-weight: normal; font-stretch: inherit; line-height: normal; font-family: inherit; font-size: 15px; vertical-align: baseline; display: inline; text-indent: 0px; text-align: center; text-transform: none; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">m=3.26 g=0.00326 kgm=3.26 g=0.00326 kg

Since it has 3" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; nt-variant: inherit; font-weight: normal; font-stretch: inherit; line-height: normal; font-family: inherit; font-size: 15px; vertical-align: baseline; display: inline; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">FeFe and 4" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant: inherit; font-weight: normal; font-stretch: inherit; line-height: normal; ; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">44 atoms of an unknown substance, therefore:

3+4=7&#xA0;atoms,1&#xA0;mol=6.022&#x22C5;1023&#xA0;atoms76.022&#x22C5;1023=1.16&#x22C5;10&#x2212;23" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; font-style: normal; font-variant: : ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; width: 10000em !important; ; font-family: inherit; eight: none; min-width: 0px; min-height: 0px; position: relative;">0.003260.00326 by 1.16&#x22C5;10&#x2212;23" role="presentation"; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">1.16⋅10−231.16⋅10−23 and I obtained 2.79429&#x22C5;1019" role="presentation" style="box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; f inherit; font-size: 15px; vertical-align: baseline; display: inline; text-indent: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">2.79429⋅10

IT'S TOTAL ANSWER OF ITS AND THIS QUESTION IS IN MATHEMATION FINAL EXAM. PLEASE GIVE❤ AND MARK ME A BRAINLIST

7 0
2 years ago
What is the difference between chemical and physical change with respect
kozerog [31]

Answer:

Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance.

Explanation:

5 0
3 years ago
Read 2 more answers
Which pair shares the same empirical formula? C2H4 and C6H6 CH2 and CH4 CH3 and C2H6 CH and C2H4
hoa [83]

Answer:

CH3 and C2H6

Explanation:

4 0
3 years ago
Read 2 more answers
Other questions:
  • 2503(g) → 2502(g) O2(g)
    8·1 answer
  • How does chromatography relate to gel electrophoresis
    15·1 answer
  • The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supporte
    13·2 answers
  • The combustion of a sample of butane, C4H10 (lighter fluid), produced 2.46 grams of water. 2 C4H10 + 13 O2 -------&gt; 8 CO2 + 1
    12·1 answer
  • If the potato solution was boiled for 10 minutes and cooled for 10 minutes before being tested, the average time for the disks t
    11·1 answer
  • Which of the following could be the name of the substance in box ‘c` choose only one box:
    13·1 answer
  • 3.<br> КОН<br> +<br> Н3РО4<br> 1<br> K3PO4<br> +<br> Н2O
    12·1 answer
  • Crude oil is a mixture of many different chemical compounds.
    8·1 answer
  • Is the supply of copper-rich ores greater or lesser than iron-rich ores?
    9·1 answer
  • a gas exerts a pressure of 1.00 atm at 273 K. At what tempreture the gas exerts a pressure of 4.00 atm.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!