A group of plant cells are placed in water an are kept in the dark. The cells eventually all die. Which option most accurately Describes why the cells died?

1. The cells did not have access to sunlight. The cells died when existing reserves of sunlight were used up.

2. The cells did not have access to oxygen to create carbon dioxide. it is carbon dioxide that fuels the cellular activities that maintain life.

3. The cells did not have access to carbon dioxide. The cells died when existing reserves of carbon dioxide were used up

4. The cells did not have access to sunlight to create more sugar. it is sugar that fuels the cellular activities that maintain life.

1. The cells did not have access to sunlight. The cells died when existing reserves of sunlight were used up.

Explanation:

It is pretty obvious it is 1. I don't have to Explain any more than this

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.