3 years ago

On average, how many hours of sleep do teenagers need each night? 7 hours 7.5 hours 8 hours 8.5 hours

Chemistry

2 answers:

Marrrta [24]3 years ago

5 0

Answer:

8 to 8.5 since that is the recommended and people usualy sleep more than that

Vera_Pavlovna [14]3 years ago

3 0

Answer:

7.5

Explanation:

i listened to the other dude and got it wrong but it showed this answer to be correct

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Give an example of a physical property that is also a characteristic property

Andrej [43]

Color, odor, taste, etc

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3 years ago

HURRY ! the BEST I will give the brainliest ! Show you solution

omeli [17]

Vi = 0

Vf = 15

time = 8

a = ?

Vf = Vi + (a × time)

15 = 0 + (a × 8)

15 = 8a

Divide both side

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4 years ago

3. How many moles are in 1.49 x 1023 molecules of iodine?

tino4ka555 [31]

Answer:

<h3>The answer is 0.25 moles</h3>

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

$n = \frac{1.49 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1.49}{6.02} \\ = 0.247508305...$

We have the final answer as

<h3>0.25 moles</h3>

Hope this helps you

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3 years ago

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inna [77]

Answer:

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