28.0 L of a gas at 45.0 C is expanded to 34.0 L and cooled to 35.0 C. The final pressure of the gas is 2.00 atm. What was the initial pressure in atm?

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

diaria maybe go see a doctor about that