Imagine that you have collected a sample of gas in a balloon. You know that the sample of gas has a volume of 0.65 L and a density of 0.5 g/L. The balloon is at
room temperature (20°C) and the Earth's average atmospheric pressure (1.00
atm). You then place the balloon in a freezer where the temperature is 0°C. What
is the new density of the gas sample in the balloon?

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.