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
Natali5045456 [20]
3 years ago
11

The empirical formula of a compound is CH. At 200 degree C, 0.145 g of this compound occupies 97.2 mL at a pressure of 0.74 atm.

What is the molecular formula of the compound
Chemistry
1 answer:
Vladimir [108]3 years ago
6 0

Answer:

The molecular formula = C_{6}H_{6}

Explanation:

Given that:

Mass of compound, m = 0.145 g

Temperature = 200 °C

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

T(K) = T( °C) + 273.15  

So,  

T = (200 + 273.15) K = 473.15 K

V = 97.2 mL = 0.0972 L

Pressure = 0.74 atm

Considering,  

n=\frac{m}{M}

Using ideal gas equation as:

PV=\frac{m}{M}RT

where,  

P is the pressure

V is the volume

m is the mass of the gas

M is the molar mass of the gas

T is the temperature  

R is Gas constant having value = 0.0821 L.atm/K.mol

Applying the values in the above equation as:-

0.74\times 0.0972=\frac{0.145}{M}\times 0.0821\times 473.15

M=78.31\ g/mol

The empirical formula is = CH

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 = 12 + 1 = 13 g/mol

Molar mass = 78.31 g/mol

So,  

Molecular mass = n × Empirical mass

78.31 = n × 13

⇒ n ≅ 6

The molecular formula = C_{6}H_{6}

You might be interested in
A balloon containing helium gas expands from 230
Anit [1.1K]

The answer for the following problem is mentioned below.

  • <u><em>Therefore the final  moles of the gas is 14.2 × </em></u>10^{-4}<u><em> moles.</em></u>

Explanation:

Given:

Initial volume (V_{1}) = 230 ml

Final volume (V_{2}) = 860 ml

Initial moles (n_{1}) = 3.8 ×10^{-4} moles

To find:

Final moles (n_{2})

We know;

According to the ideal gas equation;

    P × V = n × R × T

where;

P represents the pressure of the gas

V represents the volume of the gas

n represents the no of the moles of the gas

R represents the universal gas constant

T represents the temperature of the gas

So;

    V ∝ n

\frac{V_{1} }{V_{2} } = \frac{n_{1} }{n_{2} }

where,

(V_{1}) represents the initial volume of the gas

(V_{2}) represents the final volume of the gas

(n_{1}) represents the initial  moles of the gas

(n_{2}) represents the final moles of the gas

Substituting the above values;

   \frac{230}{860} = \frac{3.8 * 10^-4}{n_{2} }

  n_{2} = 14.2 × 10^{-4} moles

<u><em>Therefore the final  moles of the gas is 14.2 × </em></u>10^{-4}<u><em> moles.</em></u>

7 0
3 years ago
An objects kinetic energy increases as its velocity increases?
stira [4]

Answer:

Because kinetic energy is proportional to the velocity squared, increases in velocity will have an exponentially greater effect on translation kinetic energy. Doubling the mass of an object will only double its kinetic energy, but doubling the velocity of the object will quadruple its velocity.

4 0
3 years ago
Read 2 more answers
Drag each label to the correct location. An element’s position in the periodic table provides information about its atomic struc
Mekhanik [1.2K]

Answer:

Wa hatjejr jdbdj aldvdid so ini

4 0
3 years ago
Read 2 more answers
What is a renewable source of energy? a. An energy resource that is used up over time. b. An energy resource that is available a
nikdorinn [45]
Hello There!

The correct answer would be B
4 0
2 years ago
Read 2 more answers
Plz help with those questions :D
OverLord2011 [107]
A and B should be correct
8 0
2 years ago
Other questions:
  • What is the empirical formula for a substance that contains 24.59% phosphorus and 75.41% fluorine by mass?
    8·1 answer
  • Name 2 ways forelimbs are different than hind limbs.
    10·1 answer
  • How does the polarity of water give it this solvent property
    11·2 answers
  • For an ideal gas condition, what is the mass (g) of N2 if the pressure is 2.0 atm, the volume is 25 mL and the temperature is 29
    8·1 answer
  • Which phrase justifies why the theory of evolution is a theory and not a law?
    7·2 answers
  • If a cell wants to tell another cell what to do, it will send the message through
    13·1 answer
  • Which word best describes the upper mantle a) liquid, b) solid, c) plastic-like
    10·2 answers
  • 5. Chlorine gas was formed at the ... *
    6·1 answer
  • Help im struggling frfr
    5·2 answers
  • In this experiment the crest of one wave combined with the crest of the second wave to produce _______________.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!