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lys-0071 [83]
3 years ago
5

Is light and sound matter? why or why not?

Chemistry
1 answer:
Kipish [7]3 years ago
3 0
Light and sound aren't matter because Photons have no mass.
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How many moles are in 3.00x 10^22 atoms of He?
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Answer:

<h2>0.05 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

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L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{3.0 \times  {10}^{22} }{6.02 \times  {10}^{23} }  \\  = 0.049833...

We have the final answer as

<h3>0.05 moles</h3>

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