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
podryga [215]
3 years ago
8

What is the empirical formula of a substance that is 53.5% carbon (c), 15.5% hydrogen (h), and 31.1% nitrogen (n) by weight?

Chemistry
2 answers:
RUDIKE [14]3 years ago
8 0
Assuming 100 grams of the compound, we can convert the masses to the number of moles using the atomic masses:
     53.5 g * 1 mol C / 12.0107 g C = 4.45 mol C
     15.5 g * 1 mol H / 1.00794 g H = 15.38 mol H
     31.1 g * 1 mol N / 14.0067 g N = 2.22 mol N

We divide the number of moles of each element by the lowest number of moles, in this case, we divide by 2.22:
     C 4.45/2.22 = 2.00
     H 15.38/2.22 = 6.93 ≈ 7
     N 2.22/2.22 = 1

Therefore we can write the empirical formula using the number of moles calculated as the subscript for each element: C2H7N
Hoochie [10]3 years ago
4 0
Empirical formula is the simplest ratio of whole numbers of components making up a compound.
since percentage compositions have been given, we can calculate the masses of elements in 100 g of the compound 
                          carbon                   hydrogen                 nitrogen 
mass                   53.5 g                     15.5 g                      31.1 g
number of moles 53.5/12                    15.5/1                     31.1 / 14 
                             = 4.46                      = 15.5                    = 2.22
divide by least number of moles 
                              4.46/2.22 = 2.0      15.5/2.22 = 6.9       2.22/2.22 = 1
numbers rounded off
C - 2
H - 7
N - 1
Then empirical formula - C₂H₇N
You might be interested in
A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration o
HACTEHA [7]

Answer:

1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Explanation:

From the question given above, the following were obtained:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Volume of solution = 20.4 mL

Concentration of solution =?

Next, we shall determine the mass of sodium hydroxide, NaOH. This can be obtained as as illustrated below:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Mass of NaOH =?

Mass of NaOH = (Mass Cylinder + NaOH) – (Mass of empty cylinder)

Mass of NaOH = 31.92 – 9.5

Mass of NaOH = 22.42 g

Finally, we shall determine concentration of the solution as follow:

Mass of NaOH = 22.42 g

Volume of solution = 20.4 mL

Concentration of solution =?

Concentration = mass /volume

Concentration of solution = 22.42 / 20.4

Concentration of solution = 1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Therefore, the concentration of the solution is 1.1 gmL¯¹

3 0
3 years ago
Which of the following are peninsulas in Southeast Asia?
xxTIMURxx [149]

Answer:

B.

Explanation:

5 0
3 years ago
What does the group number of A elements in the A/B numbering system)
Ivanshal [37]

Answer:

All elements in the same A group will have the same number of

valence electrons.

Explanation:

Group A has 1 valence electrons.

4 0
3 years ago
Define atmpospheric pressure
krok68 [10]

Answer:

that pressure is called atmospheric pressure or air pressure. It is the force exerted on a surface by the air above is as gravity pulls it to earth. atmospheric pressure is commonly measured with a barometer. In a barometer , a column of mercury is a glass tube rises ot falls as the weight of the atmospheric changes

5 0
3 years ago
How many moles of Mg3(PO4)2 are in 350.00 grams of Mg3(PO4)2?
dusya [7]

Answer:

1.3 moles/ 1.33150727 moles

Explanation:

350g x 1 mol/262.86g = 1.3 moles

6 0
3 years ago
Read 2 more answers
Other questions:
  • Using Hooke's law, F s p r i n g = k Δ x , find the distance a spring with an elastic constant of 4 N/cm will stretch if a 2 new
    7·2 answers
  • A solution
    7·1 answer
  • How would you describe the particles that make up a liquid? are the shape and volume of liquids definite or indefinite?
    12·1 answer
  • If an element has more than one ionic charge, how is that piece of information represented in a chemical name?
    12·1 answer
  • In the 1 H NMR spectrum of chloroethane the methylene group is split into a quartet by the α and β nuclear spins of the protons
    8·1 answer
  • The formula H2O2 is an example of *
    13·1 answer
  • What is the equation for determining gas pressure?
    5·2 answers
  • Is silver nitrate a gas or solid
    11·2 answers
  • W(OH)2 + 2 HCl → WCl2 + 2 H2O
    15·1 answer
  • N₂(g) + 3H₂(g) → 2NH3(g)
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!