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
leonid [27]
3 years ago
6

The analysis of a hydrocarbon revealed that it was 85.7% C and 14.3% H by mass. When 1.77 g of the gas was stored in a 1.500-L f

l ask at 17 ?C, it exerted a pressure of 508 Torr. What is the molecular formula of the hydrocarbon?
Chemistry
1 answer:
gtnhenbr [62]3 years ago
5 0

Answer:

The formula of hydrocarbon = C_3H_6

Explanation:

Moles =\frac {Given\ mass}{Molar\ mass}

% of C = 85.7

Molar mass of C = 12.0107 g/mol

% moles of C = 85.7 / 12.0107 = 7.14

% of H = 14.3

Molar mass of H = 1.00784 g/mol

% moles of H = 14.3 / 1.00784 = 14.19

Taking the simplest ratio for C and H as:

7.14 : 14.19 = 1 : 2

The empirical formula is = CH_2

Also, Given that:

Pressure = 508 Torr

Temperature = 17 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15  

So,  

T = (17 + 273.15) K = 290.15 K  

Volume = 1.500 L

Using ideal gas equation as:

PV=nRT

where,  

P is the pressure

V is the volume

n is the number of moles

T is the temperature  

R is Gas constant having value = 62.3637 L.torr/K.mol

Applying the equation as:

508 Torr × 1.500 L = n × 62.3637 L.torr/K.mol × 290.15 K  

⇒n = 0.0421 moles

Given that :  

Amount  = 1.77 g

Molar mass = ?

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

0.0421\ moles= \frac{1.77\ g}{Molar\ mass}

Molar mass of the hydrocarbon = 42.04 g/mol

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,  

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Mass from the Empirical formula = 1×12 + 2×1= 14 g/mol

Molar mass = 42.04 g/mol

So,  

Molecular mass = n × Empirical mass

42.04 = n × 14

⇒ n = 3

<u>The formula of hydrocarbon = C_3H_6</u>

You might be interested in
What is the relationship between living things that depend on
o-na [289]

Answer:

Id say A. Competition, hope this helps

Explanation:

6 0
3 years ago
Which statements would be expected to be true for Organesson? Select all that apply.
NISA [10]

Answer:It has the lowest effective nuclear charge of the four new elements.

5 0
2 years ago
The process that causes a spark to occur when the discharge wand is close to the Van de Graaff generator is similar to the proce
guajiro [1.7K]

Answer:

Lighter, positively charged particles form at the top of the cloud. Heavier, negatively charged particles sink to the bottom of the cloud. When the positive and negative charges grow large enough, a giant spark - lightning - occurs between the two charges within the cloud.

Explanation:

4 0
2 years ago
Which of the following is the ultimate byproduct of weathering?
NikAS [45]
Soil
the answer is soil

6 0
3 years ago
Read 2 more answers
I don’t understand how to do this
djverab [1.8K]
Carbon dioxide is a carbon atom and two oxygen atoms, therefore CO2

For the others, they are hydrocarbons.
The first part of the name is determined by how many carbon atoms there are. The second part, is by the type. Alcohol, Alkane, Alkene, alkynes, acid, esters, amides.

7 0
3 years ago
Other questions:
  • The spontaneous reaction that occurs when the cell in the picture operates is as follows: 2Ag+ + Cd(s) à 2 Ag(s) + Cd2+ (A) Volt
    11·1 answer
  • Potassium hydrogen phthalate is often used to standardize solutions of strong bases. Highly pure samples of this solid weak acid
    10·1 answer
  • Antonio and his friend found a piece of metal which they want to identify. Here is what they figure out so far: Mass of this met
    12·1 answer
  • What solutes are soluble in water?
    11·1 answer
  • Which of the following types of energy does an object store in the bonds of atoms and molecules? (5 points)
    8·1 answer
  • How many mmHg are in 1.6320 atm
    15·2 answers
  • Which of the following properties are most typical for nonmetals? Check all that apply.
    9·2 answers
  • Relation between enviromment population and devlopment​
    8·2 answers
  • Which of the following pairs of compounds will react to form a precipitate? Why?
    9·1 answer
  • Please help it's due today
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!