Metallic molybdenum can be produced from the mineral molyb- denite, MoS,. The mineral is first oxidized in air to molybde-
num trioxide and sulfur dioxide. Molybdenum trioxide is then
reduced to metallic molybdenum using hydrogen gas. The bal-
anced equations are
MoS2(s) + O2(g) → MoO3(s) + 2SO2(8)
MoO3(s) + 3H2(g) → Mo(s) + 3H2O(1)
Mass
Volume
Temperatu
Pressure
Calculate the volumes of air and hydrogen gas at 17°C and 1.00
atm that are necessary to produce 1.00 X 109 kg of pure molyb-
denum from MoS2. Assume air contains 21% oxygen by volume
and assume 100% yield for each reaction.

What layer of the atmosphere is directly above the troposphere?

Which of these is a physical property

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.