Given the following equation, answer the questions that follow.

(a) What mass of O₂ will react with 4.10 g PbS?
(b) What is the theoretical yield of PbO?

Strategy

The same series of steps used in Example 3.17 is used for this problem. The chemical equation can be used to determine the amounts of reactants consumed (part a), as well as the amounts of products formed in the reaction (needed in part b). The flow diagram that outlines the strategy for part a is.

Example 3.17

Determine the mass of Ga₂O₃ formed from the reaction of 14.5 g gallium metal with excess O₂.

Strategy

Solve the problem by using the four-step procedure just outlined:

(1) Write the balanced equation;

(2) Calculate the moles of the given substance, gallium, from the mass;

(3) Use the chemical equation to calculate the moles of desired species, Ga₂O₃, from the moles of gallium;

(4) Finish the problem by calculating the mass of Ga2O3 from the moles of Ga₂O₃. Th e information needed for steps 2 and 4 comes from the periodic table and the chemical formulas, and step 3 from the coefficients in the equation. Because the oxygen is in excess, the amount of product formed will depend only on the amount of the gallium.

Transcribed Image Text:

2PbS+ 30₂ → 2PbO + 2SO₂