Alarge number of molecules begin moving very fast, rarely bumping into one another, and taking up the entire space available to them. as the temperature drops and the kinetic energy of the particles decreases, the particles move more slowly and run into each other more often. they eventually form a lattice structure, only slightly moving. what is this process called?
vaporization, then condensation
sublimination, then freezing
freezing
condensation, then freezing
decrease in temperature

Condensation, then freezing is the correct option.

Explanation:

Condensation is defined as the process in which vapor state of a substance changes into liquid state.

Vaporization is defined as the process in which liquid state of a substance changes into vapor state.

Freezing is defined as the process in which liquid state of a substance changes into solid state.

Sublimation is defined as the process in which a solid changes directly into vapor state without undergoing liquid state.

In a solid, particles are arranged in a crystal lattice as they are held together by strong intermolecular forces of attraction due to which these molecules are unable to move from their mean position.

So, in the given situation when the particles move more slowly and run into each other more often. They eventually form a lattice structure, only slightly moving. Then it means substance has first changed into liquid state and then finally it became a solid.

Thus, we can conclude that this process is called condensation, then freezing.

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.