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
choli [55]
2 years ago
6

A 1.0857 gram pure sample of a compound containing only carbon, hydrogen, and oxygen was burned in excess oxygen gas. 2.190 g of

carbon dioxide and 0.930g of water were produced. Find the empirical formula of the compound.
Chemistry
1 answer:
Goryan [66]2 years ago
3 0

Answer:

  • C₂ H₄ O

Explanation:

<u>1) Mass of carbon (C) in 2.190 g of carbon dioxide (CO₂)</u>

  • atomic mass of C: 12.0107 g/mol
  • molar mass of CO₂: 44.01 g/mol
  • Set a proportion: 12.0107 g of C / 44.01 g of CO₂ = x / 2.190 g of CO₂
  • Solve for x:

         x = (12.0107 g of C / 44.01 g of CO₂ ) × 2.190 g of CO₂ = 0.59767 g of C

<u />

<u>2) Mass of hydrogen (H) in 0.930 g of water (H₂O)</u>

  • atomic mass of H: 1.00784 g/mol
  • molar mass of H₂O: 18.01528 g/mol
  • proportion: 2 × 1.00784 g of H / 18.01528 g of H₂O = x / 0.930 g of H₂O
  • Solve for x:

        x = ( 2 × 1.00784 g of H / 18.01528 g of H₂O) × 0.930 g of H₂O = 0.10406 g of H

<u>3) Mass of oxygen (O) in 1.0857 g of pure sample</u>

  • Mass of O = mass of pure sample - mass of C - mass of H
  • Mass of O = 1.0857 g - 0.59767 g - 0.10406 = 0.38397 g O

Round to four decimals: Mass of O = 0.3840 g

<u>4) Mole calculations</u>

Divide the mass in grams of each element by its atomic mass:

  • C: 0.59767 g / 12.0107 g/mol = 0.04976 mol
  • H: 0.10406 g / 1.00784 g/mol = 0.10325 mol
  • O: 0.3840 g / 15.999 g/mol = 0.02400 mol

<u>5) Divide every amount by the smallest value (to find the mole ratios)</u>

  • C: 0.04976 mol / 0.02400 mol = 2.07 ≈ 2
  • H: 0.10325 mol / 0.02400 mol = 4.3 ≈ 4
  • O: 0.02400 mol / 0.02400 mol = 1

Thus the mole ratio is 2 : 4 : 1, and the empirical formula is:

  • <u>C₂ H₄ O </u>← answer
You might be interested in
how does getting funding from the government affect scientific research?? a- the government helps the scientist decide what rese
sertanlavr [38]

Answer:

d- Scientists have to follow government rules made to protect people.

Explanation:

Scientific research fosters our understanding of the world around us. It helps people to learn to promote critical thought and problem-solving.  Although there may not be an immediate practical use of the research, in the long term the study could benefit humanity. Scientific research is the product of creative ideas and collaborative communication that the proper role of government is often restricted to funding the research. The role of the government is to perform its reasonable and valid duties of defending human rights and enhancing the independence of the human.

4 0
3 years ago
Which letter corresponds with the location of f orbitals on the periodic table?
Lerok [7]

Answer:

The correct would be C i think :)

Explanation:

Stay postivie :)

8 0
2 years ago
Quick question plz . .....Which one of the following is acidic oxide?
dedylja [7]

Answer:

B

Explanation:

its an acidic oxide, it disolves in water to form carbonic acid which is an acid

8 0
2 years ago
Which SI unit indicates the mass on an average-sized box of breakfast cereal?
marin [14]
Well, i checked my cereal box and it says "net wait g (500)" so it's probably Grams

Answer = (C.) g
3 0
3 years ago
A 3.8-mol sample of KClO3 was decomposed according to the equation. How many moles of O2 are formed assuming 100% yield?
kari74 [83]

Answer:

5.7 moles of O2

Explanation:

We'll begin by writing the balanced decomposition equation for the reaction. This is illustrated below:

2KClO3 —> 2KCl + 3O2

From the balanced equation above,

2 moles of KClO3 decomposed to produce 3 moles of O2.

Next, we shall determine the number of mole of O2 produced by the reaction of 3.8 moles of KClO3.

Since 100% yield of O2 is obtained, it means that both the actual yield and theoretical yield of O2 are the same. Thus, we can obtain the number of mole of O2 produced as follow:

From the balanced equation above,

2 moles of KClO3 decomposed to produce 3 moles of O2.

Therefore, 3.8 moles of KClO3 will decompose to produce = (3.8 × 3)/2 = 5.7 moles of O2.

Thus, 5.7 moles of O2 were obtained from the reaction.

3 0
2 years ago
Other questions:
  • If you took an empty balloon, weight it on a scale then filled the balloon up with air and weighed it again would you expect the
    15·1 answer
  • Match the particle to the description
    12·1 answer
  • Explain the formation of coke?
    8·1 answer
  • In a titration of 47.41 mL of 0.3764 M ammonia with 0.3838 M aqueous nitric acid, what is the pH of the solution when 47.41 mL +
    8·1 answer
  • Which is not a characteristic of a mineral?
    13·1 answer
  • How many atoms of carbon are in 6CO2 + 6H2O --&gt; C6H12O6 + 6O2
    5·1 answer
  • Dl water will test<br> _________for protein?
    5·1 answer
  • Predict the precipitate that will be formed in the following reaction:<br> NaF(aq) + AgNO3(aq) →
    8·1 answer
  • What is the pH of a 1.0 x 102 M solution of HNO,?
    12·1 answer
  • Lookup, verify and write down the correct Lewis dot structure for tartaric acid. How many total lone pairs are there in one mole
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!