A cylinder contains 3.1 L of oxygen at 300 K and 2.7 atm. The gas is heated, causing a piston in the cylinder to move outward. The heating causes the temperature to rise to 610 K and the volume of the cylinder to increase to 9.4 L. How many moles of gas are in the cylinder?
Express your answer using two significant figures.

The moles of gas present in the cylinder is 0.34 moles.

Explanation:

Given: = 2.7 atm,   = 3.1 L,     = 300 K

= ?,       = 9.4 L,       = 610 K

Formula used to calculate the final temperature is as follows.

Substitute the values into above formula as follows.

Now, moles present upon heating the cylinder are as follows.

Thus, we can conclude that moles of gas present in the cylinder is 0.34 moles.

first one is the correct answer