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seropon [69]
3 years ago
6

Explain how the mucles and other organs are dependent on the brain

Chemistry
1 answer:
White raven [17]3 years ago
8 0

Answer:

The brain's signals.

Explanation:

The brain sends signals to the muscles to contract and release. Without the brain the muscles would not be controlled and you would not be able to use them for anything that you want to.

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12. A helium-filled weather balloon has a volume of 2.4 x 102 L at 99 kPa pressure and a
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Answer:

The answer to your question is 8.74 g of He

Explanation:

Data

V = 2.4 x 10² L

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Process

1.- Convert kPa to atm

P = 99 kPa = 99000 Pa

                   1 atm --------------- 101325 Pa

                    x       ---------------   99000 Pa

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2.- Convert temperature to °K

°K = 273 + 0

°K = 273

3.- Substitution

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- Solve for n

      n = PV / RT

      n = (0.977)(2.4 x 10²) / (0.082)(273)

      n = 24.48 / 22.386

      n = 1.093 moles

4.- Calculate the grams of He

          8 g -------------------- 1 mol

           x    -------------------- 1.093 moles

           x = (1.093 x 8) / 1

           x = 8.74 g                      

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