Question

10.0 liters of oxygen are contained in a diver's tank at 20.0°C and 2.0 atm pressure. What is the pressure when the tank is left exposed to the sun and it is heated to 45°C?

Answer 1

The question is asking about the relationship between pressure (p) and temperature (t). So, we do not need to worry about the volume (v). To answer this, add 273 to both temperatures so that they will be in Kelvin. Then use the formula p1/t1=p2/t2. So we would end up with 2.0/293 = ?/318. Use algebra to solve the problem for p2 and you will have the new pressure after the tank has been exposed to the sun, which is 2.170

Answer 2

Given :

Volume (V) of O2 in the tank = 10 L

Initial temperature T1 = 20 C = 20 + 273 K = 293 K

Initial pressure P1 = 2.0 atm

Final temperature T2 = 45 C = 45 + 273 = 318 K

To determine:

The final pressure P2 in the tank

Step-by-step explanation:

The ideal gas equation is given as-

PV = nRT

In this the volume V of O2, number of moles of O2 and the gas constant R, remain unchanged even when the tank is exposed to the sun.

i.e. P/T = nR/V or P/T = constant

This is the Charles Law which can be written as:

P1/T1 = P2/T2

P2 = P1T2/T1 = 2.0 * 318 K/293 K = 2.17 atm

Ans: The pressure when the tank is exposed to the sun and heated to 45 C is 2.17 atm or 2.2 atm