Question

the following questions please

1. Why is an airplane pressurized? 2. Why does a scuba diver need increased gas pressure in the air tank? 3. How does temperature affect the kinetic energy of gas molecules? 4. A balloon is filled with 652 mL of helium at a pressure of 1.00 atm. What is the new volume, in milliliters, if the pressure decreases to 738 mmHg, with T and n constant? 5. A sample of neon gas occupies 75.0 mL at 25°C. What is its new volume, in milliliters, if the temperature decreases to -12 °C, with P and n constant?

Answer 1

Question 1.

Airplanes are pressurized because the air is very thin at the altitude they fly. To prevent all of these complications, the cabins of many aircraft are pressurized to near sea level pressure, which makes breathing in an airplane about the same as breathing at sea level.

Question 2.

A scuba diver needs increased gas pressure in the air tank because the deeper the diver descends the more pressure that is applied to the body, the increase allows for divers to breathe under these extreme pressures.

Question 3.

Higher the temperature of gas molecules, the greater is the kinetic energy (K.E.).

Average K.E = 3/2 RT

Question 4.

P1V1 = P2V2

i.e. 760 mmHg * 652 mL = 738 mmHg * V2

Therefore, the new volume (V2) = 671.44 mL

Question 5.

V1/T1 = V2/T2

i.e. 75 mL/(25+273.15) K = V2/(-12 + 273.15) K

Therefore, the new volume (V2) = 65.69 mL