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
Serggg [28]
3 years ago
9

A 20.0 gram sample of an element contains 4.95 x 1023 atoms. what is the element?

Chemistry
1 answer:
Sonja [21]3 years ago
7 0
You will want to find how many grams are in a whole mole so you know which element it is. To do this, find out how much of a mole you have.

4.95 x 10^23 atoms / 6.022 x 10^23 atoms (one whole mole of any element) = .8219860511 or ~82% of 1 mole

Now we know that, find what to multiply 20 g by to get the rest of the mole.

1 mole / .8219860511 mole = 1.216565657

20 g x 1.216565657 = ~24.33 g / mol

Now that you have grams per mole, you can look at the periodic table and the molar masses to see which this number is closely aligned.

Your answer is Magnesium (Mg), which has a molar mass of 24.305 g


You might be interested in
Which of the analogies below is a location-based analogy?
nydimaria [60]
D is the correct answrt
4 0
3 years ago
Suggest a way of improving
bezimeni [28]

Explanation:

when water is boiling and when u cover it and increase the pressure it causes the increase in rate of condensation.

4 0
3 years ago
Would be glad if you helped me!
Sindrei [870]
A) Fe⁰ ----> Fe⁺³ +3e⁻   oxidation        | *2
b) <u>Cu⁺² + 2e⁻ -----> Cu⁰  reduction      |*3</u>

c) 2Fe⁰ +3Cu⁺² -----> 2Fe⁺³ + 2Cu⁰
6 0
3 years ago
How long would it take Jesse, with an acceleration of -2.50 m/s², to bring his bicycle, with an initial velocity of 13.5 m/s, to
lbvjy [14]

Answer:

i am so sorry. i do not have a answer but i am trying to find questioms i can answer

6 0
3 years ago
A solution made by mixing 20.0 g of a non-volatile compound with 125 mL of water at 25°C has a vapor pressure of 22.67 torr. Wha
Ainat [17]

We have that the molecular weight (3sf) of the compound (g/mol)

m=44.15g/mol

From the question we are told

A solution made by mixing 20.0 g of a non-volatile compound with 125 mL of water at 25°C has a vapor pressure of 22.67 torr. What is the molecular weight (3sf) of the compound (g/mol).

Generally the equation for the Rouault's law is mathematically given as

P=P_0 N

22.67=23.8*\frac{\frac{12.5}{18}}{\frac{125}{18}+\frac{15}{m}}\\\\\6.95+\frac{15}{m}=7.29\\\\\frac{15}{m}=7.29-6.95\\\\m=\frac{15}{0.34}\\\\m=44.11g/mol

Therefore

The molecular weight (3sf) of the compound (g/mol)

m=44.15g/mol

For more information on this visit

brainly.com/question/17756498

4 0
2 years ago
Other questions:
  • An element like silicon is not usually used to make wires or pans because it?
    11·1 answer
  • which type of cell is a rose thorn A prokaryotic B eukaryota plant C eukaryotic animal D chloroplastic
    13·2 answers
  • Give an example of organic and inorganic compound
    8·1 answer
  • What is the difference between naoh(s) and naoh(aq)?
    10·2 answers
  • When you remove energy from particles they move _____<br> and the matter _____
    7·1 answer
  • Is an apple seed a compound or a mixture?
    12·2 answers
  • Why is combustion an important reaction in the atmosphere?
    5·2 answers
  • 1. How many moles of nitrogen monoxide can be made using 5.0 moles of oxygen in the following composition reaction?
    10·2 answers
  • 620 mL of nitrogen at standard pressure is compressed into a 480 mL container. What is the new pressure in kPa?
    7·1 answer
  • The aria ""batter my heart"" from doctor atomic has musical influences from which era?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!