A '5.0 L' tank of helium, which is kept at a pressure of h5.0 MPa (1 MPa or megapascal = 1000 kPa) in a room with a temperature of 22.0°C, is used to blow up
balloons. The balloons, when inflated, have a volume of 2.0 L and maintain a
pressure of 115 kPa without breaking. If the temperature remains constant, what
is the maximum number of balloons that can be filled with this tank?

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.