Aluminum sulfide will form in a reaction with 7.27 g of aluminum and 8.46 g of sulfur. How many grams of aluminum sulfide was formed with the aluminum? How many grams of aluminum sulfide was formed with the sulfur? What is the limiting reactant? What is the excess reactant?

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It would be true sodium reacts with water in a violent way 

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.