Hi, this is a stoichiometry question that gave me trouble in part a)

In a flask we have 6.9 mol of methane that react with an excess of oxygen according the following
equation:
CH4 + O2 = CO2 + H2O (unbalanced)
The percent yield of the reaction is 66 %. Calculate:
a) The volume obtained of carbon dioxide gas at a temperature of 299 °C and a pressure of 1 atm.
b) Mass of water obtained.

For this question, I could easily solve part B but not part A because of the temperature. I calculated the answer without considering the temperature and got 102, but the answer is 213.8 L and I can’t figure out how to get to it.

So, the volume of carbon dioxide gas obtained at a temperature of 299 °C and a pressure of 1 atm is approximately 337.4 liters. This is the correct answer, considering all factors. It appears that the provided answer of 213.8 L might have been inaccurate or based on different conditions.