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
Natasha_Volkova [10]
3 years ago
6

How many moles of oxygen can be formed from 250 grams of aluminum oxide

Chemistry
1 answer:
Oksanka [162]3 years ago
8 0
2Al₂O₃ = 4Al + 3O₂

M(A₂O₃)=101.96 g/mol
m(Al₂O₃)=250 g

n(O₂)=3m(Al₂O₃)/{2M(Al₂O₃)}

n(O₂)=3*250/{2*101.96}=3.678 mol
You might be interested in
Lice are parasitic insects that live on the scalp, eyebrows, and eyelashes of humans
earnstyle [38]

Answer:

Most likely A

Explanation:

Its a more plausible answer

5 0
3 years ago
A 100-watt light bulb radiates energy at a rate of 100 J/s. (The watt, a unit of power or energy over time, is defined as 1 J/s.
Semmy [17]

Answer

2.7956 * 10^19 photons

Givens

  • Wavelength = λ = 525 * 10^-9 meters  [1 nmeter = 1*10^-9 meters]
  • c = 3 * 10^8 meters
  • E = ???
  • W = 100  watts
  • t = 1 second
  • h= plank's Constant = 6.26 * 10^-34 J*s

Formula

E = h * c / λ

W = E / t

Solution

E = 6.26 * 10^-34 j*s * 3 * 10^8 m/s /525 * 10^-9 (m)

The meters cancel out. So do the seconds. You are left with Joules as you should be.

E =  3.577 * 10^-18 Joules

What you have found is the energy of 1 photon.

Now you have to find the Joules from the watts.

W = E/t

100 * 1 second = 100 joules

1 photon contains 3.577 * 10 ^ - 18 Joules

x photon = 100 joules                        

1/x = 3.577 * 10^-18 / 100                          Cross multiply

100 = 3.577 * 10 ^ - 18 * x                         Divide both sides by 3.577 * 10 ^ - 18

100/3.577 * 10 ^ - 18 = 3.577 * 10 ^ - 18x / 3.577 * 10 ^ - 18

2.7956 * 10^19 photons = x


7 0
2 years ago
Illustrate: The Avogadro constant is so large it is normally written in scientific notation. To
Licemer1 [7]

Answer:

602200000000000000000000

Explanation:

move the decimal place over 23 places to the right

5 0
2 years ago
Read 2 more answers
Combining Boyle's law and Charles' law forms one presure-temperature-volume relationship and holds the mass of the gas constant.
Oksanka [162]

(P1V1/T1)=(P2V2/T2)

I just took the test and this should be correct

4 0
3 years ago
What happens when you grow the same crop over and over again in the same field
irinina [24]
Well there's a couple reasons why. First, the land itself can become “tired" and less fertile<span>. This is because the same type of </span>crop<span> planted repeatedly in the same area keeps draining the land of the same nutrients needed for that plant's growth. Pest can also plant their nest near the crop if the farmer continues to plant the same crop in the same place. 

Which is the reason why things such as "crop rotation" exist to keep things fresh, and prevent what I described above from happening.</span>
6 0
3 years ago
Other questions:
  • A substance that speeds up a chemical reaction without being part of the chemical change, itself:
    7·1 answer
  • Which of the following is true? A. Lithium is the least reactive element in group 1, because it is the smallest and holds its va
    10·1 answer
  • Test (Speed, Velocity and Acceleration)
    14·1 answer
  • How is the decomposing of water a chemical change?
    12·2 answers
  • On a roller coaster, where is maximum kinetic energy I’ll mark the brainiest.
    13·2 answers
  • Why are K3[Cr(C2O4)3].3H2O, K2[Cu(C2O4)2].2H2O and K3[Fe(C2O4)3].3H2O coloured, whereas K3[Al(C2O4)3.3H2O is colourless? ​
    12·1 answer
  • Which of the following is an example of chemical weathering?
    13·1 answer
  • 3. Identify the 4 primary pigments found in plant leaves (name and color)
    7·1 answer
  • A gas phase mixture of H2 and N2 has a total pressure of 784 torr with an H2 partial pressure of 124 torr. What mass of N2 gas i
    12·1 answer
  • Identify the steps that are followed in taking a stratified random sample. i. Take a sample of size n/k from each strata, where
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!