Chem 9

For the reaction represented by the equation Pb(NO3)2+2KI -> PbI2+2KNO3, how many moles of lead iodide are produced from 300.0 g of potassium iodide when Pb(NO3)2 is in excess?

0.9 mol PbI2

***Use Cl2+2KBr -> 2KCl+Br2 for the last 3 problems How many moles of potassium chloride are produced from 119.0 g of potassium bromide when Cl2 is in excess? How many grams of potassium chloride will be produced when 300.0 g of Cl2 is mixed with 300.0 g of KBr? What is the percentage yield if 200. G of Cl2 reacts with an excess of KBr to produce 410.0 g of Br2?

1 mol KCl 6.3 g KCl 91.6%

If cyclohexanol (C6H12O) is burned as a fuel according to the following equation, how many moles of oxygen are needed to produce 13.7 moles of carbon dioxide? 2C6H12O+17O2 -> 12CO2+12H2O

19.4 mol O2

In the reaction represented by the equation 2Na+2H2O -> 2NaOH+H2, how many grams of hydrogen are produced if 120.0 g of Na and 80.0 g of H2O are available?

4.4 g H2

For the reaction represented by the equation 2KClO3 -> 2KCl+3O2, how many grams of potassium chlorate are required to produce 160.0 g of oxygen?

40.9 g KClO2

In the equation 2Al2O3 -> 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

4:3

For the reaction represented by the equation 2Fe+O2 -> 2FeO, how many grams of iron oxide will be produced from 8.00 mol of iron when O2 is in excess?

574.4 g FeO

According to the equation C3H8+5O2 -> 3CO2+4H2O, when )2 is in excess, how many grams of carbon dioxide are produced from the combustion of 250.0 g of ethane, C3H8?

748 g CO2

Calculate the percentage yield for the reaction represented by the equation CH4+2O2->2H2O+CO2 when 1000.0 g of CH4 react with excess O2 to produce 2300.0 g of CO2.

83.6%

For the reaction represented by the equation N2+3H2->2NH3, how many moles of nitrogen (N2) are required to produce 18 mol of ammonia (NH3)?

9

In the reaction represented by the equation A+B -> C+D, if there is more reactant B than is required to completely react with all of A, then

A is the limiting reactant

Which of the following mathematical expressions correctly states the relationship among percentage yield, actual yield, and theoretical?

Both (b) and (c) (b: percentage yield... & c: theoretical yield...)

Which expression can be used to solve a mass-to-mole conversion for the equation 2HCl -> H2 + Cl2?

Mass HCl x (1 mol HCl / molar mass HCl) x (1 mol Cl2 / 2 mol HCl)

Fewer steps are required to solve stoichiometry problems when

The reactant is given in moles and the product is sought in moles

Actual yield must be determined by

experiments

The actual yield of a chemical reaction is generally

less than the theoretical yield

The participation of reactants in a chemical equation is restricted by the

limiting reactant

A balanced chemical equation allows one to determine the

mole ratio of ay two substances in the reaction

The coefficients in a chemical equation represent the

relative numbers of moles of reactants and products