Assuming an efficiency of 20.40%, calculate the actual yield of magnesium nitrate formed from 125.5 g of magnesium and excess copper(II) nitrate.
Mg + Cu(NO3)2
Mg(NO3)2 + Cu
actual yield:

257 grams h2o i think

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.

You can just look up the questions individually and get the answers