A steel bottle contains argon gas at STP.What is the final pressure if the temperature is changed to 85°C?
A)0.666 atm
B)0.762 atm
C)0.850 atm
D)1.31 atm

Question

Quizplus · Accepted Answer

At STP, the temperature is 0°C, which is 273 K. The pressure of the argon gas is 1 atm. If we increase the temperature to 85°C, which is 358 K, the pressure will increase. We can use the ideal gas law to calculate the new pressure:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

At STP, we have one mole of argon gas and a volume of 22.4 L, so we can rearrange the equation to solve for the new pressure:

P2 = (nRT2) / V

P2 = (1 mol x 0.08206 L atm / (mol K) x 358 K) / 22.4 L

P2 = 1.31 atm

Therefore, the final pressure is 1.31 atm, which is closest to choice D: 1.31 atm.

A Steel Bottle Contains Argon Gas at STP