Chemistry Chapter 9
Which coefficients correctly balance the formula NH4NO2 = N2 + H20?
2, 2, 2,
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?
3.0 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?
4.5 g
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?
7.0 mol
For the reaction represented by the equation N2 + 3H2 = 2NH3, how many moles of nitrogen are required to produced 18 mol of ammonia?
9.0 mol
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.
In the chemical equation wA + xB = yC + zD, if one knows the mass of A and the molar masses of A, B, C, and D, one can determine
The mass of any of the reactants or products.
Which of the following would be investigated in reaction stoichiometry?
The masses of hydrogen and oxygen in water
Given the equation 3A + 2B + 2C, the starting mass of A, and its molar mass, and you are asked to determine the moles of C produced, your first step in solving the problem is to multiply the given mass of A by
1 mol A ----------- Molar mass A
For the reaction represented by the equation Cl2 + 2KBr = Br2, how many moles of potassium chloride are produced from 119 g of potassium bromide?
1.00 mol
For the reaction represented by the equation 2H2 + O2 = 2H2O, how many grams of water are produced from 6.00 mol of hydrogen?
108 g
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 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 g
For the reaction represented by the equation Cl + 2KBr = 2KCl + Br2, how many grams of potassium chloride can be produced from 300.g each of chlorine and potassium bromide?
188 g
Ozone, O, is produced by the reaction represent 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
For the reaction represented by the equation C + 2H2 = CH4, how many moles of hydrogen are required to produce 10 mol of methane, CH4?
20 mol
Which equation is NOT balanced?
2H2 + O2 + H20
For the reaction represented by the equation SO3 + H20 + H2SO4, how many grams of sulfur trioxide are required to produce 4.00 mol of sulfuric acid in an excess of water?
320. g
In the equation 2KCIO = 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol of KCIO3 decompose completely?
4.5 mol
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 2KIO3 = 2KCl + 3O2, how many moles of potassium chlorate are required to produced 250.g of oxygen?
5.21 mol
For the reaction represented by the equation 2HNO3 + Mg(OH)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 g
For the reaction represented by the equation CH4 + 2O2 = 2H2O, how many moles of carbon dioxide are produced from the combustion of 100.g of methane?
6.23 mol
For the reaction represented by the equation CH4 + 2O2 = 2H2O + CO2, calculate the percentage yield of carbon dioxide if 1000.g of methane react with excess oxygen to produce 2300.g of carbon dioxide.
83.88%
For the reaction by the equation Mg + 2HCl = MgCl2, calculate the percentage yield of magnesium chloride if 100.g of magnesium react with excess hydrochloride acid to yield 330.g of magnesium chloride.
84.2%
When the formula equation Fe3O4 + Al = Al2O3 + Fe is correctly balanced the coefficient of Fe is number
9
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.
To balance a chemical equation, it may be necessary to adjust the
Coefficients
The units of molar mass are
g/mol
The coefficients in a chemical equation represent the
Relative numbers of moles of reactants and products.
For the reaction represented by the equation Pb(NO3)2 + 2Kl = 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
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 g
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
A determination of the masses and number of moles of sulfur and oxygen in the compound sulfur dioxide would be studied in
Composition stoichiometry
What is the study of the mass relationships of elements in compounds?
Composition stoichiometry
If one knows the mass and molar mass of reactant A and the molar mass of product D in a chemical reaction, one can determine the mass of product D produced by using the
Mole ratio of D to A from the chemical equation.
What is the study of the mass relationships among reactants and products in a chemical reaction?
Reaction stoichiometry
A chemical equation is balanced when the
Same number of each kind of atom appears in the reactant and in the products.
Which brance of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
Stoichiometry
In what kind of reaction do two or more substances combine to form a new compound?
Synthesis reaction
A balanced chemical equation allows one to determine the
mole ratio of any two substances in a reaction .
