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
blagie [28]
3 years ago
5

Consider a sample of a hydrocarbon (a compound consisting of only carbon and hydrogen) at 0.959 atm and 298 K. Upon combusting t

he entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 1.208 atm and 375 K. This mixture has a density of 1.1128 g/L and occupies a volume five times as large as that of the pure hydrocarbon. Determine the molecular formula of the hydrocarbon.
Chemistry
1 answer:
Masja [62]3 years ago
7 0

Answer:

Molecular formula of hydrocarbon is: C₂H₆

Explanation:

The combusting of the hydrocarbon:

CxHy + O₂ → CO₂ + H₂O

Using gas law to obtain molar mass of the gas mixture (CO₂ + H₂O):

P/RT = n/V

Where:

P is pressure (1,208 atm)

R is gas constant (0,082 atmL/molK)

T is temperature (375 K)

n/V = 0,0393 mol/L

1,1128 g/L ÷ 0,0393 mol/L = 28,32 g/mol

Thus, average molecular weight is:

28,32 g/mol = 44,01 g/mol X + 18,02 g/mol Y

1 = X + Y

Where X is CO₂ molar percentage and Y is H₂O molar percentage.

Solving:

X = 0,397

Y = 0,603

39,7% H₂O

60,3% CO₂

With this proportion you can obtain ratio CO₂:H₂O thus:

60,3/39,7 = 1,52 So, 2 CO₂: 3H₂O

The moles of the hydrocarbon are:

PV/RT = n

P (0,959 atm)

V ( 1/5 of final volume)

T (298K)

n = 7,85x10⁻³ mol

The moles of CO₂ are:

0,0393 mol × 2 mol CO₂/ 5 mol total =0,01572.

Ratio of CO₂:CxHY =

0,01572 : 7,85x10⁻³ 2 CO₂: 1 CxHY

Doing:

1 CxHy + O₂ → 2 CO₂ + 3 H₂O

By mass balance:

1 C₂H₆ + 7/2 O₂  → 2 CO₂ + 3 H₂O

Thus, molecular formula of hydrocarbon is: <em>C₂H₆ </em>

I hope it helps!

You might be interested in
What are 3 pairs of atoms that will react?​
vivado [14]

Answer:

Phosphorus Trichloride, water and carbon dioxide

5 0
3 years ago
The reaction is called chain reaction when
Maru [420]

Answer:

c. it involves a series of steps, each of which generates a reactive intermediate that brings about the next step

Explanation:

A chain reaction consist of many repeating steps. Chain reaction will never stop until all the reactant has been exhausted. It is more of a cycle of reaction that generate a reactive intermediate that brings about the next step.

Example of a chain reaction is the chlorination of methane.

CH4 + Cl2  ↔ CH3Cl + HCl

CH3Cl  + Cl2  ↔ CH2Cl2 + HCl

CH2Cl2 + Cl2  ↔ CHCl3 + HCl

CHCl3 + Cl2  ↔ CCl4 + HCl

7 0
3 years ago
Is carbon dioxide a pure substance
iVinArrow [24]

Answer:

It is not a pure substance.

6 0
3 years ago
Why does your finger seem to move? How is this related to the parallax of stars?
sleet_krkn [62]
<span>he easiest way to see parallax is to hold out your finger vertically in front of a background object, a door or wall for example. Shut your right eye and note where on the background object the image of your finger appears. Now open your right eye and close the left one without moving your finger. The image of your finger should appear to have jumped to a different spot on the background wall. It is possible to tell how far away your finger is from your eyes just by measuring the distance between your eyes and the distance that the image appeared to move in degrees of arc. </span>
3 0
3 years ago
Please help<br>............​
Levart [38]

Answer:

Explanation:

An ammeter, a voltmeter. The third one i didnt know it

3 0
3 years ago
Other questions:
  • What is the proper name for this fomula BaCl 2
    12·2 answers
  • What is 673.5 in scientific notation
    13·2 answers
  • A buffer is prepared by mixing 204.0 mL of 0.452 mol/L hydrochloric acid (HCI) and 500.0 mL of 0.400 mol/L sodium acetate (NaCHC
    14·1 answer
  • Which change is most likely to occur when a molecule of h2 and a molecule i2 collide with proper orientation and sufficient ener
    14·2 answers
  • I bet half these people are kids from lhs rite now lol
    9·2 answers
  • The density of wind-packed snow is estimated to be 0.35 g/cm^3. A flat roof that is 35 by 43 feet has 28 inches of snow on it. H
    15·1 answer
  • E ) The distribution coefficient , Ko ( Cether / C water ) , for an organic substance X at room temperature is 13. What relative
    13·1 answer
  • Which of these is an example of chemical separation of a substance?
    13·1 answer
  • 100 points please help me will also mark brainliest!
    11·2 answers
  • What is the product of the unbalanced combustion reaction below?<br> C3H8(g) + O₂(g)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!