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
yaroslaw [1]
3 years ago
10

You perform a combustion analysis on a 255 mg sample of a substance that contains only C, H, and O, and you find that 561 mg of

CO2 is produced, along with 306 mm of H2O.
if the substance contains only C, H, and O, what is the empirical formula
if the molar mass of the compound is 180 g/mol what is the molecular formula of the compound
Chemistry
2 answers:
alexgriva [62]3 years ago
6 0

Answer:

molecular formula of compound =C₉H₂₄O₃

Explanation:

The compound contains only C,H and O

The combustion equation for carbon is:

C+O_{2}-->CO_{2}

Thus if we are obtaining 44g of carbon dioxide it means the amount of carbon is 12g.

If we are getting 1g of carbon dioxide, it means the amount of carbon = \frac{12}{44}g

If we are getting 561mg of carbon dioxide, it means the amount of carbon=\frac{12X561}{44}=153mg

So the mass of carbon in the given sample = 153mg

Percentage of carbon = \frac{massofcarbonX100}{massofsample}=\frac{153X100}{255}=60

The combustion equation for hydrogen is:

H_{2}+0.5O_{2}-->H_{2}O

Thus if we are obtaining 18g of water it means the amount of hydrogen is 2g.

If we are getting 1g of water, it means the amount of hydrogen = \frac{2}{18}g

If we are getting 306mg of water, it means the amount of hydrogen=\frac{2X306}{18}=34mg

So the mass of hydrogen in the given sample = 34mg

Percentage of hydrogen = \frac{massofhydrogenX100}{massofsample}=\frac{34X100}{255}=13.33

Percentage of oxygen=100-(60+13.33)=26.67%

The moles of each element in 100g of sample will be

moles of carbon = \frac{mass}{atomicmass}=\frac{60}{12}=5

moles of hydrogen = \frac{mass}{atomicmass}=\frac{13.33}{1}=13.33

moles of oxygen = \frac{mass}{atomicmass}=\frac{26.67}{16}=1.67

Let us divide all the moles with 1.67

moles of carbon = 3

moles of hydrogen = 8

moles of oxygen = 1

So the empirical formula of the compound would be:C₃H₈O

The empirical mass = 60

molar mass = 180g

So the molecular formula will be = \frac{180}{60}Xempiricalformula

molecular formula=C₉H₂₄O₃

zhuklara [117]3 years ago
5 0
The combustion of an organic compound is mostly written as,
                        CaHbOc + O2 --> CO2 + H2O
where a, b, and c are supposed to be the subscripts of the elements C, H, and O in the compound. Determining the number of moles of C and H in the product which is the same as that in the compound,
   (Carbon, C)   :   (561 mg) x (12/44) = 153 mg x (1 mmole/12 mg) = 12.75
   (Hydrogen, H) :  (306 mg) x (2/18)  = 34 mg x (1 mmole/1 mg) = 34 
   Calculating for amount of O in the sample,
(oxygen, O) = 255 - 153 mg - 34 mg = 68 mg x (1mmole/16 mg) = 4.25 
The empirical formula is therefore,
                        C(51/4)H34O17/4
                           C3H8O1
The molar mass of the empirical formula is 60. Therefore, the molecular formula of the compound is,
                                C9H24O3
You might be interested in
Scientific not'n:
Usimov [2.4K]

Answer:

MP hippopotamus science and not expanded form for 3.8 132

Explanation:

down by the Bayou Tiana hippopotamus a white cheese Arby's Arby's Lala grammarly biu I am a lesbian

6 0
3 years ago
Explain your reasoning. Match each explanation to the appropriate blanks in the sentences on the right.
skelet666 [1.2K]

Answer:

A (I_2(g), Br_2 (g), Cl_2 (g), F_2 (B): The ranking can best be explained by the trend entropy decreases as 5. molar mass decreases.

B (H_2O_2 (g), H_2S(g), H_2O(g): The ranking can best be explained by the decreases a trend entropy decreases as 3. molar mass and structure complexity decreases.

C. (C(s, amorphous), C(s, graphite), C(s, diamond): The ranking can best be explained by the trend entropy decreases as 4. structure complexity decreases.

Explanation:

Hello.

In this case, we can understand a higher entropy when more disorder is present and a lower entropy when less disorder is present, thus:

A (I_2(g), Br_2 (g), Cl_2 (g), F_2 (B): The ranking can best be explained by the trend entropy decreases as 5. molar mass decreases since iodine has the greatest molar mass (254 g/mol) and fluorine the least molar mass (38 g/mol).

B (H_2O_2 (g), H_2S(g), H_2O(g): The ranking can best be explained by the decreases a trend entropy decreases as 3. molar mass and structure complexity decreases since hydrogen peroxide weights 34 g/mol as well as hydrogen sulfide but the peroxide has more bonds (more complex, higher entropy).

C. (C(s, amorphous), C(s, graphite), C(s, diamond): The ranking can best be explained by the trend entropy decreases as 4. structure complexity decreases since diamond has a well-ordered structure and amorphous carbon has a very disordered one.

Best regards.

4 0
3 years ago
Name the element which has twice the number of electrons in its second shell as in the first shell write it's electronic configu
Basile [38]
CARBON! :) it’s the 6th element
3 0
3 years ago
Whats the molar mass of potassium nitride
Lyrx [107]
<span>The answer is
101.1032 g/mol</span>
6 0
3 years ago
Name the molecule when potassium reacts with chlorine?
Dominik [7]

Answer: Potassium Chloride

Explanation:

4 0
3 years ago
Other questions:
  • Compound A has molecular formula C7H15Br. Treatment of compound
    6·1 answer
  • An iodine atom has seven valence electrons. Do you think it will lose seven electrons or gain
    5·1 answer
  • A nanotechnology equipment requires 7.40 x 10^18 atoms of potassium. What is the mass of this sample?
    12·1 answer
  • What observations can you make about the valence electrons in the following columns of the periodic table?
    12·1 answer
  • Which type of reaction is Mg + S → MgS?
    12·2 answers
  • 4. What is the rarest element that is natural to earth?
    12·2 answers
  • Which of the following naming rules would apply to CaCO3? A. metal + polyatomic anion B. polyatomic cation + nonmetal anion(ide)
    10·2 answers
  • Which of the following units is not an official SI unit?
    13·2 answers
  • Compare the nuclear charge of nitrogen to oxygen on the valance electrons.
    12·1 answer
  • An ice cube absorbs 353 cal of
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!