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
RUDIKE [14]
3 years ago
11

A teacher divides her class into groups and assigns each

SAT
1 answer:
In-s [12.5K]3 years ago
4 0

The group that measures precisely and all three times.

You might be interested in
Determine the empirical formula of a compound containing 47. 37 grams of carbon, 10. 59 grams of hydrogen, and 42. 04 grams of o
Effectus [21]

Considering the definition of empirical formula, the empirical formula is C₃H₈O₂ and the molecular formula is C₉H₂₄O₆.

<h3>Definition of empirical formula</h3>

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

<h3>Empirical formula in this case</h3>

In this case, you have:

  • Carbon (C): 47.37 grams
  • Hydrogen (H): 10.59 grams
  • Oxygen (O):  42.04 grams

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

  • Carbon (C): \frac{47.37 grams}{12 \frac{g}{mole} }= 3.95 moles
  • Hydrogen (H): \frac{10.59 grams}{1 \frac{g}{mole} }= 10.59 moles
  • Oxygen (O):  \frac{42.04 grams}{16 \frac{g}{mole} }= 2.63 moles

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

  • Carbon (C): \frac{3.95 moles}{2.63 moles }= 1.5
  • Hydrogen (H): \frac{10.59 moles}{2.63 moles }= 4
  • Oxygen (O):  \frac{2.63 moles}{2.63 moles }= 1

Finally, since in the empirical formula the numbers of moles must be expressed in whole numbers, the ratio of atoms is multiplied by some number with which everything is obtained in simple whole numbers (in this case by 2):

  • Carbon (C): 1.5× 2= 3
  • Hydrogen (H): 4× 2= 8
  • Oxygen (O):  1× 2= 2

Therefore the C: H: O mole ratio is 3: 8: 2

Finally, the empirical formula is C₃H₈O₂.

<h3>Molecular formula</h3>

To obtain the molecular formula you must relate its molecular weight (PMc) with the molecular weight of the empirical formula (PMfe).

PMfe= PM (C₃H₈O₂)= 76 g/mole

The molar mass of the compound (PMc) was determined to be 228.276 g/mol. Dividing this mass PMc by the molar mass of the empirical formula PMfe gives:

228.276 g/mol ÷ 76 g/mole= 3

This means that in the molecular formula there are 3 unit formulas (empirical formulas), so it is necessary to multiply the number of all atoms by 3.

Then, the molecular formula is C₉H₂₄O₆.

Learn more about empirical formula:

brainly.com/question/21081934?referrer=searchResults

brainly.com/question/5115389?referrer=searchResults

brainly.com/question/4594902?referrer=searchResults

brainly.com/question/13725914?referrer=searchResults

brainly.com/question/13599051?referrer=searchResults

brainly.com/question/13112542?referrer=searchResults

3 0
2 years ago
Where can you find an online library catalog weegy.
irakobra [83]

People finds information from online library catalog. Where can you find an online library catalog is Any of the library's computers, and often the library's homepage.

An online library catalog is known to be an electronic bibliographic database that shows or talks about the books, videotapes, etc. that is often seen and carried by a specific library.

It is known to have originated from a printed source and the library card catalog. It is known to have drawers that has the records of particular items in the library.

See full question below

Where can you find an online library catalog?

A. It depends on whether the library uses the Dewey Decimal System or the Library of Congress System

B. In the same physical location with the card catalog

C. Any of the library's computers, and often the library's homepage

D. Behind the reference librarian's desk

Learn more about Library from

brainly.com/question/475367

4 0
2 years ago
URGENT!!!! In 50 words or less summarize the logistics of the ACT test.
Mnenie [13.5K]

Answer: The ACT is a standardized test that measures a student's skills in five core areas: English, math, reading, science, and writing (optional). Students in grades 11 and 12 take the ACT so that they can submit their scores to colleges as part of the college application process. 75 questions in 45 min.

4 0
3 years ago
The original supply curve is $1. A change in supply occurred to S2. Choose the correct
BaLLatris [955]
It’s 9 I took the test
8 0
3 years ago
Read 2 more answers
Which of the following about persuasive speaking is not true.
Ksenya-84 [330]

Answer:

Please, provide with options.

Explanation:

Thank you!!

7 0
2 years ago
Other questions:
  • What’s the correct answer
    6·1 answer
  • HELP‼️ Which transformation did NOT take place?
    6·2 answers
  • What does "He will prevail" mean
    5·1 answer
  • GPA Scale:
    8·1 answer
  • Which of these is an example of a public interest group?.
    12·1 answer
  • How is suspense created for the reader in this passage.
    12·1 answer
  • What mass of water can be heated from 250c to 500c by the addition of 2825 j? specific heat of water = 4. 18 j/g/k.
    6·1 answer
  • In a balanced chemical equation the numbers of individual particles
    5·1 answer
  • Big ideas math: modeling real life grade 6 assessment book answer key
    11·1 answer
  • What is the process of working for a client whose opponent is on the opposite side called?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!