What does a strong nuclear force do in an atom?
a. it repels electrons from other electrons.
b. it repels protons from other protons.
c. it attracts protons and neutrons.
d. it attracts protons and electrons.

Option (c) is the correct answer.

Explanation:

It is known that an atom contains protons, electrons and neutrons.

Protons and neutrons reside inside nucleus of the atom whereas electrons revolve around the nucleus.

Protons have positive charge, neutrons have no charge and electrons have a negative charge.

So, inside the nucleus protons repel each other due to the same charge. Therefore, a greater force acts on the nucleus which helps to overcome the repulsive force force between the protons inside the nucleus and this force is known as nuclear force.

Thus, we can conclude that a strong nuclear force in an atom attracts protons and neutrons.

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.

c8h10 is your answerr