Question

In the following problem, which is the unknown quantity?
A sample of helium gas has a volume of 546 mL at a pressure of 1.60 atm and a temperature of 137
°C. What is the pressure of the gas in atm when the volume is 657 mL and the temperature is 158°C?
A) P2
B) P1
C) V1
D) V2

Answer 1

The pressure of the gas at the new volume and temperature is the unknown.

Gas law

Using the general gas law:

P1V1/T1 = P2V2/T2

Where

• P1 = initial pressure of the gas = 1.60 atm
• V1 = initial volume of the gas = 546 mL
• T1 = initial temperature of the gas = 137 °C
• V2 = Final volume of the gas = 657 mL
• T2 = final temperature of the gas = 158 °C
• P2 = final pressure of the gas = not given

Thus, the unknown is the final pressure, which is P2.

More on gas law can be found here: https://brainly.com/question/1190311