When heated sufficiently, lead (IV) oxide undergoes a decomposition reaction to form lead (II) oxide and oxygen. A sample of PbO2 is heated. It produces 0.250 g of O2. What was the mass of PbO2 before it was heated?

An impure sample of table salt (NaCl) that was dissolved in water and treated with silver nitrate to form silver chloride. If the initial sample had a mass of 1.741 g and the final mass of the AgCl was found to be 4.084 g, what is the mass percent of NaCl in the impure sample?

When copper is heated with an excess of sulfur, copper(I) sulfide is formed. In a given experiment, 1.50 g of copper was heated with excess sulfur to yield 1.79 g copper(I) sulfide. What is the percent yield?

11. Elemental phosphorus, P4, reacts vigorously with oxygen to give P4O10. What is the mass of P4O10 that can be produced if 3.75 g of P4 is reacted with 6.55 g of oxygen?  If any reagent was in excess, how much of it will be leftover when the reaction is finished?

If the reaction N2 + 3 H2 → 2 NH3 is carried out using 1.40 g of N2 and 0.468 g of H2, what mass of excess reactant will remain?

A student performed a similar experiment to the one you performed: They took a crucible and lid, cleaned them, heated them over a flame, and after cooling found their combined mass to be 22.538 g. The student then added a sample of zinc(II) sulfate hydrate (ZnSO4·“n”H2O) to the crucible so the combined mass of the sample, crucible, and lid was 25.896 g. They heated this sample for 10 minutes with the lid ajar, let it cool, and measured the mass of the crucible, sample, and lid to be 25.054 g. a. Based on this experiment, what is the formula for they hydrated zinc(II) sulfate compound? b. The student later looked on the reagent bottle for zinc(II) sulfate hydrate and found the actual formula was ZnSO4·7H2O. If everything had been done correctly, what value should the student have expected for the final mass of their sample, crucible, and lid after heating?

In an experiment, 3.250 g of NH3 reacted with 3.50 g of O₂. Supposed that the reaction produced 2.13 g NO, what is the percent yield of the reaction if the predicted amount is 3.51 g of NO?

When copper is heated with an excess of sulfur, copper(I) sulfide is formed. In a given experiment, 1.50 g of copper was heated with excess sulfur to yield 1.80 g copper(I) sulfide. What is the percent yield?

Consider the reaction of solid P₄ and chlorine gas to form gaseous phosphorus trichloride. The balanced chemical equation is P₄(s) + 6 Cl₂(g) → 4 PCl₃(g). How many grams of phosphorus trichloride can be formed from 419.7 grams of P₄ based on the balanced chemical equation?

Antimony is alloyed with lead to increase the rigidity of components used in the construction of lead storage batteries.4.435 g of a particular metallic alloy, compounded of only Pb and Sb, can be quantitatively converted into a 5.162-g mixture of the oxides PbO2 and Sb2O4.What was the percentage (mass) of antimony in the alloy?