5) A sample of helium gas at 27.0 °C and 3.60 atm pressure is cooled in the same

Question

5) A sample of helium gas at 27.0 °C and 3.60 atm pressure is cooled in the same container to a temperature of -73.0 °C. What is the new pressure?

6) A SAMPLE OF METHANE GAS HAS A VOLUME OF 10 L AT A PRESSURE OF 1.5 ATM AND A TEMPERATURE OF 20 °C. WHAT VOLUME DOES THE GAS OCCUPY IF THE PRESSURE IS LOWERED TO 0.9 ATM AT A TEMPERATURE OF 40 °C?

7) A sample of helium gas has a volume of 6.50 L at a pressure of 845 mmHg and a temperature of 25 °C. The pressure of the gas, in atmospheres, when the volume is 12.8 L and the temperature is 47 °C is _______.

8) A mixture of three gases, A, B, and C, has a total pressure of 8.5 atm. If the pressure of gas A is 2.4 atm and the pressure of gas B is 1.7 atm, what is the pressure of gas C?

9) IF A GAS OCCUPIES 2 L AT 273 °C, WHAT IS THE VOLUME AT 0 °C IF THE PRESSURE DOES NOT CHANGE?

Explanation / Answer

5)

We know that equation,

P1/T1 = P2/T2 thus,

P2 = T2P1/T1 where,

P1 = initial pressure = 3.6 atm

P2 = final pressure = ?

T1 = initial tempreture = 270C = 300 K

T2 = final tempreture = -730C = 200 K

substitute the value in above equation

P2 = 200X 3.6/300 = 2.40 atm

pressure at -730C = 2.40 atm

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