1 2 3 4 5 Stoichiometry Review 6 7 8 9 10

4KO2(s) + 2H2O(ℓ) → 4KOH(s) + 3O2(g) #1 Potassium superoxide, KO2, is used in rebreathing masks to generate oxygen according to the reaction below. If the mask contains 0.304mol KO2 and 0.250mol water, what is the limiting reagent and how many moles of oxygen can be produced? 4KO2(s) + 2H2O(ℓ) → 4KOH(s) + 3O2(g)

#2 Nitrogen gas can react with hydrogen gas to form gaseous ammonia according to the Haber Process. If 27.13g of nitrogen reacts with 7.09g of hydrogen, what is the limiting reagent and what volume of ammonia is formed? 𝑁 2 (𝑔)+3 𝐻 2 (𝑔)→2 𝑁𝐻 3 (𝑔)

#3 Butane, C4H10, burns in oxygen. How many liters of water vapor, H2O, are produced by the combustion of 7.51 moles of butane at standard conditions? 2C4H10 + 13O2  8CO2 + 10H2O

#4 How many grams of oxygen, at standard conditions, are needed to react with 55.25 grams of glucose, C6H12O6? C6H12O6 + 6O2  6CO2 + 6H2O

#5 A chemist uses hot hydrogen gas to convert chromium (III) oxide to pure chromium. How many moles of hydrogen are needed to convert 86.0 moles of chromium (III) oxide, Cr2O3? Cr2O3 + 3H2  2Cr + 3H2O

#6 If 187.60g of isopropyl alcohol combusts with 6.70 moles of oxygen gas, what volume of carbon dioxide will be produced? If 168.2L of carbon dioxide was recovered in the lab, what is the percent yield? 2C3H8O + 9O2  6CO2 + 8H2O

#7 How many molecules of oxygen gas are formed in 9.80 moles of KClO3? 2KClO3  2KCl + 3O2

#8 How many moles of calcium oxide would be produced if only 7.25 moles of oxygen were available? 2Ca + O2  2CaO

#9 If 8.65 x 1025 molecules of potassium chloride are produced, what mass of oxygen is also produced? 2KClO3  2KCl + 3O2

#10 If 15.06g of beryllium reacts with 9.48 x 1023molecules of hydrochloric acid (HCl), what volume of hydrogen gas would be released? If 18.3L of hydrogen gas is produced, what is the percent yield? Be + 2HCl  BeCl2 + H2