Chap 9 Test

How many moles of Ag can be produced if 350. g of Cu are reacted with excess with excess AgNO3 to produce silver and copper (II) nitrate?

11 mol of Ag

Ozone, O3, is produced by the reaction represented by the following equation: NO2(g)+O2(g)-->NO(g)+O3(g) What mass of ozone will form from the reaction 2.0 g of NO2 in a car's exhaust and excess oxygen?

2.1 g O3

Decomposition of hydrogen peroxide produces water and oxygen gas. The percentage yield of oxygen is 93.0%. What is the actual yield in grams of oxygen if you start with 100.g of H2O2?

2H2O2-> 2H20+02. 43.71g O3

What mass of oxygen gas is produced if 100. g of potassium chlorate decompose to produce potassium chloride and oxygen gas?

2KClO3-> 2KCl+3O2. 39.2g O2

What mass of PCl3 forms in the reaction of 75.0 g P4 with 275g of Cl2? P4+6Cl2-> 4PCl3

332.54 g PCl3

For the reaction represented by the equation 2Fe+3H2O->Fe2O3+3H2, how many moles of iron (III) oxide are produced from 500.g of iron in an excess of H2O?

4.47 mol

In the equation 2KClO3-> 2KCl+3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decomposed completely?

4.5 mol

For the reaction represented by the equation 2Na+2H2O->2NaOH+H2, how many grams of hydrogen are produced if 120. g of sodium and 80. g of water are available?

4.5g

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

4:3

For the reaction represented by the equation 2Na+Cl2-> 2NaCl, how many grams of chlorine gas are required to react completely with 2.00 mol of sodium?

70.9 g

For the given reaction, Mg+2HCL->H2+MgCl2, calculate the percentage yield of magnesium chloride if 100.0 g of magnesium react with excess hydrochloric acid to yield 330. g of magnesium chloride.

84.2%

Explain why it is false to say that the limiting reactant is the reactant that is present in the smaller amount?

Even though there will be a smaller amount, it depends on the stoichiometric ratio between the reactants and the "bigger amount" can be your limiting reactant.

A chemist is interested in the efficiency of a chemical reaction would calculate the

Percentage yield

What is the measured amount of a product obtained from a chemical reaction

actual yield

What is the study of the mass relationships of elements in compounds?

composition stoichiometry

The units of molar mass are

g/mol

In most chemical reactions the amount of product obtained is

less than the theoretical yield

Which reactant controls the amount of product formed in a chemical reaction?

limiting reactant

A balanced chemical equation allows one to determine the

mole ratio of any two substances in the reaction

When the limiting reactant in a chemical reaction is completely used, the

reaction stops

The coefficients in a chemical equation represent the

relative numbers of moles of reactants and products

A chemical equation is balanced when the

same number of each kind of atom appears in the reactants and in the products

Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?

stoichiometry

Which of the following would be investigated in reaction stoichiometry?

the mass of potassium required to produce a known mass of potassium chloride

What is the maximum possible amount of product obtained in a chemical reaction

theoretical yield

Compare and contrast the actual yield of a chemical reaction to the theoretical yield?

Theoretical yield is the maximum amount, actual yield is the amount measured from chemical reaction.