True, False
______1. When quantities of reactants are available in the exact ratio described by the balanced equation, they are said to be in molar proportions.
______2. The reactant that limits the amount of product that can be formed is the limiting reactant.
______3. The reactant left over is called the limiting reactant.
______4. If the amount of the limiting reactant is known, it is possible to predict the amount of all the products formed by the reaction.
______5. Percent yield = actual yield/theoretical yield
______6. The actual yield (experimental) of a chemical reaction is always more than the theoretical yield.
Answer each of the following questions in the space provided below. Show all work.
7. One mole = how many molecules?
One mole = how many liters at STP?
One mole = how many atoms?
8. What is percent yield?
9. Identify the limiting reactant when 2.2 g of magnesium react with 4.5 L of oxygen at STP to produce magnesium oxide.
10. Hydrogen is produced when methane (CH4) reacts with water. The other product is CO2. Using 80.0 g of methane and 16.3 g of water, how many liters of H2 can be produced at STP? What is the limiting reactant?
11. Methyl alcohol (CH3OH) is made by reacting 30.0L of carbon monoxide with 30.0L of H2. What mass of methyl acohol could be produced at STP? What is the limiting reactant?
12. In a reaction of 15.3 g of NaCl with 60.8 g of Pb(NO3)2, how many grams of lead(ll) chloride will be produced? What is the limiting reactant?
13. Diborane (B2H6) is widely used in the synthesis of organic compounds. Diborane itself is made by the reaction 2NaBH4 + I2 yields B2H6 + 2NaI + H2. If 6.3 g of NaBH4 are reacted with excess I2, how many grams of diborane could theoretically be isolated? If 1.9 g of diborane is actually produced, what is the percent yield of the reaction?
14. Ammonia gas can be produced by reacting CaO with NH4Cl. Water and calcium chloride are produced in addition to ammonia. If 23.0 g of CaO and 50.0 g of NH4Cl are mixed, what is the maximum possible volume of NH3 that can be produced at STP? If 16.1 L of NH3 are actually produced, what is the percent yield of NH3?