Chapter 7

For the reaction represented by the equation 2Na + 2H2O → 2NaOH + H2, how many grams of sodium hydroxide are produced from 3.0 mol of sodium with an excess of water? 120 grams

120 grams

In the reaction represented by the equation N2 + 3H2 ® 2NH3, what is the mole ratio of hydrogen to ammonia?

1:2

For the reaction represented by the equation 3Fe + 4H2O → Fe3O4 + 4H2, how many moles of iron(III) oxide are produced from 500. g of iron in an excess of H2O?

2.98 mol

For the reaction represented by the equation SO3 + H2O → H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?

320 grams

each of the four types of reaction stoichiometry problems requires using a

mole ratio

For the reaction represented by the equation Pb(NO3)2 + 2KI → PbI2 + 2KNO3, how many moles of lead(II) iodide are produced from 300. g of potassium iodide and an excess of Pb(NO3)2?

0,904 mol

Which coefficients correctly balance the formula equation NH4NO2-->N2+H2O

1,1,2

For the reaction represented by the equation 2H2 + O2 → 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?

108 grams

How many moles of Ag can be produced if 350. g of Cu are reacted with excess AgNO₃ according to the equation Cu(s) + 2AgNO₃(aq) → 2Ag(s) + Cu(NO₃)₂(aq)?

11 moles 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 of 2.0 g of NO2 in a car's exhaust and excess oxygen?

2.1 g O3

The Haber process for producing ammonia commercially is represented by the equation N2(g) + 3H2(g) ® 2NH3(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

3 mol

How many grams of ammonium sulfate can be produced if 30.0 mol of H₂SO₄ react with excess NH₃ according to the equation 2NH₃(aq) + H₂SO₄(aq) → (NH₄)₂SO₄(aq)?

3,960 g (NH₄)₂SO₄

What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal react with excess water according to the chemical equation 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)?

34.8 g NaOH

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

4.5 mol

What mass in grams of hydrogen gas is produced if 20.0 mol of Zn are added to excess hydrochloric acid according to the equation Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)?

40.4 gH2

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

4:3

For the reaction represented by the equation 2KlO3 → 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250. g of oxygen?

5.21 mol

What mass in grams of potassium chloride is produced if 100. g of potassium chlorate decompose according to the following equation? 2KClO₃(s) → 2KCl(s) + 3O₂(g)

60.8 gKCl

For the reaction represented by the equation AgNO3 + NaCl → NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO3?

7 mol

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 grams

What mass in grams of 1-chloropropane (C₃H₇Cl) is produced if 400. g of propane react with excess chlorine gas according to the equation C₃H₈ + Cl₂ → C₃H₇Cl + HCl?

712 g C₃H₇Cl

In the reaction represented by the equation N2 + 3H2 ® 2NH3, what is the mole ratio of hydrogen to ammonia?

9

When the formula equation Fe3O4 + Al → Al2O3 + Fe is correctly balanced, the coefficient of Fe is

9

A balanced chemical equation allows one to determine the

mole ratio of any 2 substances in the reaction

The unit of the following expression is ______. 100g H2O X {mol H2O/18.02g H2O}

moles H2O

For the reaction represented by the equation Cl2 + 2KBr → 2KCl + Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?

1 mol

For the reaction represented by the equation 2H2 + O2 → 2H2O, how many moles of water can be produced from 6.0 mol of oxygen?

12 mol

For the reaction C +2H2→ CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?

20 mol

In the reaction represented by the equation C + 2H2 ® CH4, what is the mole ratio of hydrogen to methane?

2:1

Which equation is not balanced

2H2+O2+H2O

For the reaction represented by the equation 2Fe + O2 → 2FeO, how many grams of iron(II) oxide are produced from 8.00 mol of iron in an excess of oxygen?

575 grams

For the reaction represented by the equation 2HNO3 + Mg(OH)2 → Mg(NO3)2 + 2H2O, how many grams of magnesium nitrate are produced from 8.00 mol of nitric acid, HNO3, and an excess of Mg(OH)2?

593 grams

For the reaction represented by the equation CH4 + 2O2 → CO2 + 2H2O, how many moles of carbon dioxide are produced from the combustion of 100. g of methane?

6,23 mol

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

actual yield

to determine the limiting reactant in a chemical reaction, one must know the

available amount of each reactant

if one knows the mole ratio of a reactant and product in a chemical reaction one can

calculate the mass of the product produced from a known mass of reactant

the proportions of the reactants and products involved in a chemical reaction are shown by the ___ in the balanced chemical equation describing the reaction.

coefficients

to balance a chemical equation, it may be necessary to adjust the

coefficients

the units of molar mass are

g/ mole

In most chemical reactions the amount of product obtained is

less than the theoretical yield

a chemical reaction involving substances A and B stops when B is completely used B is the

limiting reactant

which reactant controls the amount of product formed in a chemical reaction

limiting reactant

The expression below converts the quantity, mass HCl, to the quantity, _____. mass HCl X {1/molar mass HCl} X {1 mol Cl2/2mol HCl}

mol Cl2

the ratio of the actual yield to the theoretical yield multiplied by 100

percent yield

The efficiency of a reaction is described by the ____ yield.

percentage

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

percentage yield

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

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

stoichiometry

in what kind if reaction do two or more substances combine to form a new compound

synthesis reaction

if the percentage yield is equal to 100% then

the actual yield is equal to the theoretical yield

which of the following would not be studied in the branch of chemistry called stoichiometry

the amount of energy required to break the ionic bonds in calcium fluoride

a chemical equation is balanced when...

the same number of of each kind of atom appears in the reactant and the product.

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

theoretical yield