Prease tell me the answer. when a liquid changes to a gas below the surface of a liquid as well as at the surface, it is called

Boiling

Explanation:

As. you heat a liquid, its molecules gain kinetic energy and move faster.

Some of the molecules at the surface have enough kinetic energy to escape into the space above the surface. In a closed container, these molecules exert a pressure (called the vapour pressure) on the walls of the container.

In an open container, the molecules simply escape into the atmosphere.

If you add enough heat, the liquid will reach a temperature at which the vapour pressure equals the atmospheric pressure.

The surface molecules then have enough energy to escape freely into the atmosphere. The water has reached its boiling point.

If you keep on heating, you will see bubbles of vapour will form in the liquid and rise to the surface. When that happens, you know that the liquid is boiling.

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.