A gas has a pressure of 50.0 mm Hg at 247°C. What will be the final temperature, in K, if the pressure changes to 2.53 kPa and the volume does not change? I have been trying to use the formula (V1)P1) / (n1)(T1) = (V2)(P2) / (n2)(T2) but can not get to the answer.​

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.