Select the correct answer from each drop-down menu. Justus has a flexible container that holds 200 milliliters of air at a temperature of 300 kelvins and a pressure of 100 kilopascals. Justus wants to decrease the volume of the air inside the container to 100 milliliters. He can do this either by changing the temperature to kelvins or by changing the pressure to kilopascals.

Answer asap need to be answered 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.

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

In in , is to a 28.4-g (1-oz)−23.0 °c to −1.0 °c?