3. Chemical Reactions

The reduction of iron (III) oxide creates the following reaction: 

Fe₂O₃ (s) + 3 H₂ (g) → 2 Fe (s) + 3 H₂O (g) 

If the above reaction only went to 75% completion, how many moles of Fe₂O₃ were require to produce 0.850 moles of Fe? 

Au₂S₃ + 3 H₂ → 3 H₂S + 2 Au
How many grams of Au can be produced from 500.20 g of Au₂S₃ and 5.67 g H₂?

(CN)₂ + 7 F₂ → 2 CF₄ + 2 NF₃

What is the percent yield of the reaction if 45.0 g of CF₄ are isolated from the reaction between 75.0 g each of (CN)₂ and F₂?

For the following chemical reaction 53.1 g HBrO₄ is mixed with 25.8 g Li₂CO₃. Determine the percent yield if 7.17 g CO₂ is produced.

2 HBrO₄ (aq)  +  Li₂CO₃ (aq)  → H₂O (l)  +  CO₂ (g)  +  2 LiBrO₄ (aq)

Ammonia, NH₃, can be created from the combining of H₂ and N₂ molecules. How many grams of ammonia are isolated when 10.0 g H₂ reacts with excess N₂ with a chemical reaction that has a 79.3% yield?

3 H₂  +  N₂  →  2 NH₃

What is the percent yield of NH₃ if the reaction of 26.3 g of H₂ produces 79.0 g of NH₃?

What is the percent yield of HCl if 42.0 g of HCl are produced from the reaction of 62.0 g of PCl₃?

Imagine you were asked to assemble skateboards from decks, axles, and wheels, with each skateboard made from one deck, two axles, and four wheels.

a. What is the limiting reactant if you start from 25 decks, 48 axles, and 106 wheels?

b. What is the theoretical yield of skateboards?

c. If 22 boards are produced once the assembly is complete, what is the percent yield of skateboards?

Consider a recipe for making a club sandwich that consists of three slices toasted bread, 2 slices turkey breast, 2 pieces fried bacon, and one slice cheddar cheese.

a. If you start with 36 slices of bread, 20 slices of turkey breast, 24 pieces bacon, and 14 slices of cheese, what is the limiting reactant?

b. What is the theoretical yield of club sandwiches?

c. If you ask your roommate to prepare club sandwiches for a party and they finish with nine sandwiches, what is the percent yield of sandwiches?

a. What is the theoretical yield of CO₂ if 1.00×10³kg (1 metric ton) of CaO is obtained by thermal decomposition of CaCO₃?

b. In ordinary Portland cement, the average CaO content of the clinker (the inorganic part of the dried cement prior to adding gypsum and any additives or fillers) is 63.5%. What quantity of CO₂ is emitted to produce 1.00×10³ kg of clinker?

c. If the clinker makes up 95% of the mass of the cement, a good estimate for most cement produced in the twentieth century, what quantity of CO₂ is emitted in the production of 1.00×10³ kg of cement?

d. In some parts of the world waste products, blast furnace slag from the manufacture of steel, or fly ash from coal-fired power plants are added to cement to reduce the amount of clinker in the cement. If the clinker makes up only 60% of the cement by mass, what quantity of CO₂ is emitted in the production of 1.00×10³ kg of cement?