If 143 grams of chromium react with an excess of oxygen, as shown in the balanced chemical equation below, how many grams of chromium oxide can be formed? show all your work for the calculations for full credit.

4cr + 3o2 yields 2cr2o3

209 g

Explanation:

Molecular weight of Cr= 52g/mol

Molecular weight of = 152g/mol

As Oxygen is present in excess, Chromium is the limiting reagent as it limits the formation of product.

of Chromium produces of

Thus 143 g of Chromium(Cr) produces= of Chromium oxide()

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.