Adding concentration vs amount

[305174946]

If a question asks how the system would be affected after adding a certain concentration (molarity) is that different from adding say grams? please explain difference abnd how you would answer.

[taline_n]

Molarity is the measure of the amount of moles / liters of a substance in a reaction. Questions asking about the effect of adding or removing certain substances are usually looking for us to answer which reaction proceeds (the forward reaction which yields products, or the reverse reaction which yields reactants) depending on which side of the equilibrium increases in concentration.

If the question asks for the effect on the system when a substance is added and the unit is grams, you would have to calculate the concentration of that compound (mol/L) by dividing by the molar mass and the overall volume of the system (in Liters). You could then calculate the reactant quotient (Q) and compare it to the equilibrium constant (K) to determine whether products or reactants will form.