How many grams of nitrogen are needed to produce 100 grams of ammonia gas?

82.4 grams N₂(g)

Explanation:

3H₂(g) + N₂(g) => 2NH₃(g)

Assume excess H₂(g).

Convert gms NH₃ to moles, solve for moles of N₂ by rxn ratio then convert back to grams N₂(g).

Moles NH₃(g) = 100g/17g·mol⁻¹ = 5.882 mole NH₃(g)

Production of 5.882 mole NH₃(g) requires 1/2(5.882) mole N₂(g) = 2.9941 mole N₂(g)

Grams N₂(g) needed = 2.9941 mole N₂(g) x 28 gms/mole = 82.4 gms N₂(g).

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.