The volume of a gas is 93 mL when the temperature is 91°C. If the temperature is reduced to 0°C without changing the pressure, what will be the new volume of the gas?
A
70 mL

B
100 mL

C
120 mL

D
273 mL

The new volume of the gas is 70 mL (option A)

Explanation:

Step 1: Data given

Volume of the gas = 93 mL = 0.093 L

Temperature = 91 °C = 364 K

The temperature is reduced to 0°C = 273 K

The pressure doesn't change

Step 2: Calculate the new volume of the gas

V1/T1 = V2/T2

⇒with V1 = the initial volume of the gas = 0.093 L

⇒with T1 = the initial temperature of the gas = 364 K

⇒with V2 = the new volume = TO BE DETERMINED

⇒with T2 = the reduced temperature = 273 K

0.093L/364K = V2/273 K

V2 = 0.06975 L = 69.75 mL  ≈ 70 mL

The new volume of the gas is 70 mL (option A)

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

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