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elena-14-01-66 [18.8K]
3 years ago
6

A balloon is filled with 0.250 mole of air at 35°C. If the volume of the balloon is 6.23 liters, what is the absolute pressure

of the air in the balloon?
Chemistry
1 answer:
lord [1]3 years ago
6 0

Answer is:  the absolute pressure of the air in the balloon is 1.015 atm (102.84 kPa).

n = 0.250 mol; amount of substance.

V = 6.23 L; volume of the balloon.

T = 35°C = 308.15 K; temperature.

R = 0.08206 L·atm/mol·K, universal gas constant.

Ideal gas law: p·V = n·R·T.

p = n·R·T / V.

p = 0.250 mol · 0.08206 L·atm/mol·K · 308.15 K / 6.23 L.

p = 1.015 atm; presure of the air.

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The speed of sound in air at 20° C is 343 m/s. Its speed in water at 20° C is 1,483 m/s. How much longer would it take for sound
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22.41 seconds longer

<h3>Explanation:</h3>
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  • Examples of medium in which sound travels in are water and air.

From the question give;

Speed of sound in air at 20°C is 343 m/s

Speed of sound in water at 20°C is 1,483 m/s

We are given a distance of 10 Km or 10,000 m

We need to finder how much longer it will take for the sound to travel in air.

Time = Distance ÷ Speed

Therefore;

Time taken in Air = Distance ÷ speed of sound in air

                             = 10000 m ÷ 343 m/s

                             = 29.15 seconds

Time taken in water = Distance ÷ speed of sound in water

                                 = 10,000 ÷ 1,483 m/s

                                 = 6.74 seconds

Difference in time = 29.15 seconds - 6.74 seconds

                              = 22.41 seconds

Therefore, it takes 22.41 seconds longer for sound to travel through air than water.

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