The wording of this problem is quite strange. I attempted the problem and gave up half way through. I think I simply miscalculated when when using the PV over nT = PV over nT. Here's the problem word for word:

 

An empty glass container has a mass of 658.57 g. It has a mass of 659.45 g after it has been filled with nitrogen gas at a pressure of 790. torr and a temperature of 15 degrees C. when the container is evacuated and refilled with a certain element (A) at a pressure of 745 torr and a temperature of 26 degree C, it has a mass of 660.6 g.

 

Compound B, a gaseous organic compound that consists of 85.6% carbon and 14.4% hydrogen by mass, is placed in a stainless steel vessel (10.68 L) with excess oxygen gas. The vessel is placed in a constant-temperature bath at 22 degrees C. The pressure in the vessel is 11.98 atm. In the bottom of the vessel is a container that is packed with Ascarite and a dessicant. Ascarite is asbestos impregnated with sodium hydroxide; it quantitatively absorbs carbon dioxide:

 

The dessicant is anhydrous magnesium perchlorate, which quantitatively absorbs the water produced by the combustion reaction as well as the water produced by the above reaction. Neither the Ascarite nor the desiccant react with the compound B or oxygen. The total mass of the container with the Ascarite and desiccant is 765.3 g.

 

The reaction is initiated by a spark. The pressure immediately rises, then begins to decrease, and finally reaches a steady value of 6.02 atm. The stainless steel vessel is carefully opened, and the mass of the container inside the vessel is found to be 846.7 g. A and B react quantitatively in a 1:1 mole ratio to form one mole of the single product, gas C.

 

a. How many grams of C will be produced if 10.0 L of A and 8.6 L of B (each at STP) are reacted by a opening a stopcock connecting the two samples?

 

b. What will be the total pressure in the system?

 

Some scholar at Penn State wrote this silly problem and named it appropriately a "Marathon Problem". Do you think you could help?

I figured nobody would want to attempt this problem. Our chemistry teacher gave it to us as a challenge, but no one in the class actually solved it. I was just hoping someone could explain the steps to answering it.