Blast furnaces give off many unpleasant and unhealthy gases. If the total air
pressure is 0.99 atm, the partial pressure of carbon dioxide is 0.05
atm, and the partial pressure of hydrogen sulfide is 0.02 atm, what is
the partial pressure of the remaining air?

The partial pressure of the remaining air is 0,92 atm.

Explanation:

We apply Dalton's law: the total pressure of a gaseous mixture (in this case air) is equal to the sum of the partial pressures of the gases that make up that mixture:

P total = P C02 + P H2S + P remaining air

P remaining air= P total - P C02 - P H2S= 0,99 atm -0,05 atm -0,02 atm=

P remaining air= 0,92 atm

n2(g) + 3h2-> 2nh3(g)   this is the balanced equation

note the mole ratio between n2, h2 and nh3.   it is 1 : 3 : 2   this will be important.

moles n2 present = 28.0 g n2 x 1 mole n2/28 g = 1 mole n2 present

moles h2 present = 25.0 g h2 x 1 mole h2/2 g = 12.5 moles h2 present

based on mole ratio, n2 is limiting in this situation because there is more than enough h2 but not enough n2.

moles nh3 that can be produced = 1 mole n2 x 2 moles nh3/mole n2 = 2 moles nh3 can be produced

grams of nh3 that can be produced = 2 moles nh3 x 17 g/mole = 34 grams of nh3 can be produced

note:   the key to this problem is recognizing that n2 is limiting, and therefore limits how much nh3 can be produced.

the awnser is group 12