A steel bottle contains argon gas at STP.What is the final pressure if the temperature is changed to 125°C?

Question

Quizplus · Accepted Answer

At STP (Standard Temperature and Pressure), the temperature is 0°C or 273 K and the pressure is 1 atm. The volume is not given and is not necessary to solve this problem. Using the Ideal Gas Law: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin. Since the number of moles and volume are constant, we can write P1/T1 = P2/T2. Substituting the values: 
P1/T1 = P2/T2
(1 atm)/(273 K) = P2/(125 + 273) K
P2 = (1 atm)(398 K)/(273 K) = 1.46 atm. 
Therefore, the final pressure of Argon gas in the steel bottle at 125°C is 1.46 atm, which is option D.

A Steel Bottle Contains Argon Gas at STP