Asample containing 4.80 g of o2 gas has an initial volume of 15.0 l. what is the final volume, in liters, when each of the following changes occurs in the quantity of the gas at a constant pressure and temperature?
a. a sample of 0.500 mole of o2 is added to the 4.80 g of o2 in the container.
b. a sample of 2.00 g of o2 is removed.
c. a sample of 4.00 g of o2 is added to the 4.80 g of o2 gas in the container.

The correct answer for the question that is being presented above is this one: "A. A sample of 0.500 mole of O2 is added to the 4.80 g of O2 in the container." A sample containing 4.80 g of O2 gas has an initial volume of 15.0 L. The final volume, in liters, when each of the following changes occurs in the quantity of the gas at a constant pressure and temperature is that A sample of 0.500 mole of O2 is added to the 4.80 g of O2 in the container.

The answer is a) carbon-12