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
anyanavicka [17]
3 years ago
8

How many molecules of ethanol (c2h5oh) (the alcohol in alcoholic beverages) are present in 160 ml of ethanol? the density of eth

anol is 0.789 g/cm3. n =?
Chemistry
1 answer:
jolli1 [7]3 years ago
3 0
Note: 1 ml = 1 cm^3

Density = mass / volume
mass = density x volume
mass = 0.789 x 160 = 126.24 grams

From the periodic table:
mass of carbon = 12 grams
mass of hydrogen = 1 grams
mass of oxygen = 16 grams
molar mass of ethanol = 2(12) + 5(1) + 16 +1 = 46 grams

number of moles = mass / molar mass
number of moles = 126.24 / 46 = 2.744 moles

Each mole contains Avogadro's number of molecules.
Therefore:
number of molecules = 2.744 x 6.02 x 10^23 = 1.6518 x 10^24 molecules
You might be interested in
In stoichiometric calculations, which quantity MUST be used to convert from one chemical substance to another?
Cloud [144]

The answer is

C) mole ratio

4 0
2 years ago
We saw in the calorimeter experiment that the combustion of a fuel is exothermic. what can you then say about the formation of a
ankoles [38]

Answer:

This question appear incomplete

Explanation:

This question appear incomplete. However, fuel is formed through a natural phenomenon involving the conversion of large amount dead and decayed organisms (usually algae and zooplanktons) to combustible fuel through exposure to relatively high temperature and pressure (over millions of years) in the earth's crust. Thus, since this involves a sort of absorption of heat energy (from the earth's crust), it can be referred to be an endothermic reaction.

8 0
2 years ago
Is the bond C=O polar or non polar
rewona [7]

Answer:

Non Polar

Explanation:

Non Polar molecule because of its linear symmetric shape

6 0
2 years ago
I don’t know the answers to these pls help
stepladder [879]

Answer:

4. Option C. Pentane.

5. Option D.

Explanation:

4. Hydrocarbons are compound containing carbon and hydrogen only. Hydrocarbons are said to be saturated when they contain only carbon to carbon single bond. All alkanes are saturated hydrocarbon.

The correct answer is pentane.

5. Isomerism is the phenomenon whereby two or more compounds have the same molecular formula but different structural patterns. The compounds involved are called isomers.

A careful observation of the diagram above shows that only option D satisfied the definition of Isomerism as the two compound both have the same molecular formula as C3H8O but different structural patterns.

Note: option C does not contain isomers as Isomerism can not occur in a compound having just 1 carbon atom.

5 0
2 years ago
1. Which of the following is a combination reaction?
DaniilM [7]

Answer:

The answer to your question is: letter A

Explanation:

A combination reaction is when there are two reactants that gives only one product.

a. 2SO2 + O2—> 2SO3                          This is a combination reaction,

                                                               2 reactants gives one product.

b. Zn + Cu(NO3)2–>Zn(NO3)2 + Cu     This is not a combination reaction,

                                                                it's a single replacement reaction.

c. 2H2O2–> 2H2O+O2                          This is a decomposition reaction

d. AgNO3 + NaCl → AgCl+NaNO3        THis is a double replacement reaction.

8 0
3 years ago
Other questions:
  • PLEASEEEE HELPPPP ASAP
    9·1 answer
  • Jacob takes 7 classes, each 50.00 minutes long every day for the 5 day school week. How many hours per week does he spend in cla
    15·1 answer
  • Where do subduction zones occur
    6·1 answer
  • PLEASE HELP!
    6·1 answer
  • Calculate the pressures of NO, Cl2, and NOCl in an equilibrium mixture produced by the reaction of a starting mixture with 7.0 a
    14·1 answer
  • Boiling Point temperatures are dependent
    6·1 answer
  • C6H12O6 + 6O2 → 6CO2 + ? H2O + energy<br> Whats the answer? I really don't know,
    14·1 answer
  • 2. How would type of substance affect the rate of reaction?
    11·1 answer
  • A microwave oven uses electromagnetic radiation to heat water molecules in food or drink. This radiation has a frequency of 2.45
    11·1 answer
  • State the relationship between phase changes and heat energy.<br> In complete sentences
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!