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
8_murik_8 [283]
3 years ago
14

An unknown compound containing only C and H was burnt, yielding 10.2 g of CO2 and 6.3 g of H2O. With a molecular weight of about

30, what is the molecular formula?
Chemistry
1 answer:
Lisa [10]3 years ago
3 0

Answer:

C_2H_6

Explanation:

Hello.

In this case, we can see that the mass of carbon of the unknown compound comes from the yielded mass of carbon dioxide, thus, we compute the moles of carbon as follows:

m_C=10.2gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1mol C}{1molCO_2}=0.232 molC

Moreover, the mass of hydrogen comes from the yielded water, therefore we can also compute the moles of water:

m_H=6.3gH_2O*\frac{1molH_2O}{18gH_2O}*\frac{2molH_2}{1molH_2O}  =0.7molH

Then, to find the subscripts in the empirical formula, we divide by the moles of carbon as the smallest:

C:\frac{0.232}{0.232}=1\\ \\H:\frac{0.7}{0.232}=3

Whose molar mass is:

M_{CH_3}=12+1*3=15g/mol

Thus, the ratio of the molecular formula to the empirical formula is:

\frac{30}{15}=2

Therefore, the molecular formula is twice the empirical formula:

C_2H_6

Which is actually ethane.

Regards.

You might be interested in
Which has the strongest conjugate base?
aleksandr82 [10.1K]

Answer:

Phenol.

Explanation:

Hello there!

In this case, for this question about the strength of the resulting conjugate base, it is possible for us to know that the higher the Ka (stronger aid) the weaker the conjugate base. In such a way, since the phenol has the smallest Ka (weakest acid) we infer that it has the strongest conjugate base.

In addition to the aforementioned, the reason why phenol was the answer is because the Kb of its conjugate base is the greatest due to the Kb=Kw/Ka and thus, the smaller the Ka the bigger Kb.

Regards!

5 0
3 years ago
Tornadoes can negatively affect an ecosystem when
Lubov Fominskaja [6]

Answer:

b, their strong winds uproot many of the important plants

Explanation:

6 0
3 years ago
Read 2 more answers
Which are characteristics of natural selection? Select three options.
Luda [366]
Affects populations,
Occurs when there is genetic variation
Selects organisms with certain traits to survive.
5 0
3 years ago
Why is xenon monatomic but bromine is diatomic
WARRIOR [948]
B 3-4 is the auto
If it’s needs
8 0
2 years ago
Which of the following in the definition of control?
Advocard [28]
D The Part That Stays The Same
5 0
3 years ago
Other questions:
  • Calculate the percent dissociation of trimethylacetic acid(C6H5CO2H) in a aqueous solution of the stuff.
    15·1 answer
  • An air temperature of 95°C most often exists in which layer of the atmosphere?
    9·1 answer
  • How many atoms are in 131.97 liters of water vapor at STP?
    13·1 answer
  • How are sucrose (table sugar) and the starch in flour chemically related? what makes them different from each other?
    12·1 answer
  • To measure the amount of nickel in some industrial waste fluid, an analytical chemist adds 0.110 M sodium hydroxide (NaOH) solut
    6·1 answer
  • Which is the best definition of non polar covalent bond?
    5·2 answers
  • To find density of an object what 2 things are needed?
    8·1 answer
  • If you increase the temperature of a gas, the pressure....
    5·1 answer
  • Look at the diagram of a fuel cell used to power a motorized vehicle. A fuel cell with 2 vertical objects labeled A and B connec
    7·2 answers
  • Characteristics of a mixture?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!