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slava [35]
3 years ago
10

_Al + _O2 —> _Al2O3

Chemistry
1 answer:
Kisachek [45]3 years ago
6 0
4Al + 3O2 --> 2Al2O3.
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How many moles are in a sample of 9.47 x 1024 atoms of argon (Ar)? (Show your calculations for full credit. Correct answers will
Vitek1552 [10]

Answer:

<h2>15.73 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{9.47 \times  {10}^{24} }{6.02 \times  {10}^{23} }  \\  = 15.730897...

We have the final answer as

<h3>15.73 moles</h3>

Hope this helps you

5 0
3 years ago
Read 2 more answers
What does it mean to say that a wave is cyclic, or periodic, disturbance?
Zina [86]

Answer:

Wave is a disturbance or energy that propagate through medium from one point to other point

So basically it is a flowing energy that flows into the medium and hence medium particles start oscillating about their mean position to and fro.

This motion of medium particles or this to and fro motion is about their mean position and this will always be cyclic or periodic motion

This means the disturbance or energy continuously flow through the medium such that it will change the position of medium particle and this will be cyclic in order

For an example

y(x,t) = Asin(kx - ωt + φ)

So here above equation of wave is a travelling wave in which displacement of medium particle from its mean position is given by "y"

Now we can see that this disturbance depends upon the sine function and it will repeat its same position after every 2 pi time interval as it is cyclic function for this value

Due to this phenomenon of repetition of its same position we can say that it is disturbance of wave is cyclic.

Explanation:

4 0
3 years ago
What is an energy level
Helen [10]

Answer: The fixed amount of energy that a system described by quantum mechanics

Explanation: Quantum mechanics are molecules, atom, electron, or nucleus.

8 0
3 years ago
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7 0
3 years ago
Which gas law would you use for the following problem: What pressure is required to hold 8.0 moles of oxygen gas in an 8.0 L con
emmainna [20.7K]

Answer:

Ideal Gas Law ( PV = nRT)

Explanation:

Using the Ideal Gas Law, we have; PV = nRT

Where P= Pressure = ?

            V= Volume = 8.0 L

            n =  moles = 8.0

            R =  Gas constant = 0.0821 L.atm/mol/K

            T =  80° c + 273 =  353.15K

Therefore Pressure would be;  P = nRT/ V =  8 x 0.0821 x 353.15 / 8 = 28.9atm

5 0
3 years ago
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