Hydrogen and oxygen are combined to form water according to the equation below: 2H2 + O2→2H2O How many moles of water are produced if 10 g of oxygen gas are reacted? Type your answer as a number with 1 significant figure. Make sure to include the correct units in your answer. Units are a type of measurement i. e. gram (g) or mole (mol). Do not include the chemical formula in your 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.