A chemist reacts magnesium with hydrochloric acid and collects 57.48 mL of the hydrogen gas that is produced by water displacement. If the lab temperature is 24 C and the atmospheric pressure is 742.1 mm Hg, how many grams of hydrogen are produced? Water vapor pressure is 22.4 mm Hg at 24 C.

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.