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
grigory [225]
3 years ago
9

Determine the root-mean square speed of CO2 molecules that have an average kinetic energy of 4.2 x10-21 J per molecule.

Chemistry
1 answer:
strojnjashka [21]3 years ago
8 0
<span>Determine the root-mean-square sped of CO2 molecules that have an average Kinetic Energy of 4.21x10^-21 J per molecule. Write your answer to 3 sig figs.
</span><span>
E = 1/2 m v^2 

If you substitute into this formula, you will get out the root-mean-square speed. 

If energy is Joules, the mass should be in kg, and the speed will be in m/s. 

1 mol of CO2 is 44.0 g, or 4.40 x 10^1 g or 4.40 x 10^-2 kg. 

If you divide this by Avagadro's constant, you will get the average mass of a CO2 molecule. 

4.40 x 10^-2 kg / 6.02 x 10^23 = 7.31 x 10^-26 kg 

So, if E = 1/2 mv^2 

</span>v^2 = 2E/m = 2 (4.21x10^-21 J)/7.31 x 10^-26 kg = 115184.68 
Take the square root of that, and you get the answer 339 m/s.
You might be interested in
On a periodic table, element names are represented by:
alina1380 [7]

Answer: Symbols

Explanation:

4 0
3 years ago
What is the formula for the ionic compound of strontium and chlorine?
Leno4ka [110]
The formula is SrCl2. hope this helps
8 0
3 years ago
Which part of the food web is NOT a living thing?
stiks02 [169]

Answer:

the sun

Explanation:

the sun is not alive and plants use photosynthesis to eat the radiation emitted by the sun.

4 0
3 years ago
I need help please j
Sidana [21]
Reactants Hydrogen: 5
Products Hydrogen: 5

Reactants Carbon: 3
Products Carbon: 3

Reactants Oxygen: 4
Products Oxygen: 5
3 0
3 years ago
This is for a study guide, I can't figure it out!
miskamm [114]
<span>The answer is "D" where the number of collisions per unit area is reduced by one-half. Drawing back on the piston means the volume is increased. The pressure is reduced. There are fewer collisions when the pressure is reduced.</span>
3 0
3 years ago
Other questions:
  • Amoebas live all their lives:​
    12·1 answer
  • A blank cell has half the chromosomes of a blank cell
    8·1 answer
  • Which subatomic particle makes the atoms of each elements different?
    5·1 answer
  • What is one way to speed up a chemical reaction without otherwise affecting the reaction? A. add a catalyst B. decrease surface
    8·2 answers
  • Predict the molecular geometry about S in the molecule SO2
    6·2 answers
  • A sample of As weighs 73.2 grams. Will a sample of Kr that contains the same number of atoms weigh more or less than 73.2 grams?
    5·1 answer
  • Which of these events is caused by contact forces?
    15·1 answer
  • 14. As the temperature of a gas in a closed container increasses, what is true of the particles in the substance? (2 points)
    11·1 answer
  • When the temperature and number of particles of a gas are constant, which of the following is also constant?
    5·2 answers
  • HELP PLEASE!!!!! <br> show work
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!