1. What is the maximum mass of S8 that can be produced by combining 84.0 g of each reactant? 8SO2+16H2S⟶3S8+16H2O
2. When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced.

CaCO3(s)+2HCl(aq)⟶CaCl2(aq)+H2O(l)+ CO2(g)

How many grams of calcium chloride will be produced when 31.0 g of calcium carbonate is combined with 13.0 g of hydrochloric acid?
mass of CaCl2 :
g
Which reactant is in excess?

HCl

CaCO3
How many grams of the excess reactant will remain after the reaction is complete?
mass of excess reactant:

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

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