What is the strongest evidence for hydrogen
bonding?
1. Hydrogen has an extremely low electronegativity.
2. The boiling points of NH3, H2O, and HF
are abnormally high compared with the rest
of the hydrides in their respective periods.
3. Hydrogen can be considered either a
metal or nonmetal.
4. Hydrogen is able to accept or donate electrons, so it is the most versatile atom in the
periodic chart.

Explanation:

4.hydrogen is able to accept or donate electrons,so it is the most versatile storm I the periodic chart

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

the maximum mass of nh3 is nh3 in grams