CHEMISTRY CH 9
mole ratio of any two substances in the reaction
A balanced equation allows one to determine the...?
composition stoichiometry
A determination of the masses and number of moles of sulfur and oxygen in the compound sulfur dioxide would be studies in...?
12 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?
molar mass A/1 mol A
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 multiplying the given mass of A by...?
calculate the mass of the product produced from a known mass of reactant
If one knows the mole ratio of a reactant and product in a chemical reaction, one can...?
less than the theoretical yield
In Most chemical reactions the amount of product obtained is...?
the mass of any of the reactants or products
In the chemical equation wA + xB --> yC + zD, if one knows the mass of A and the molar mass of A, B, C, and D, one can determine...?
same number of each kind of atom appears in the reactions and in the products
a chemical equation is balanced when the...?
limiting reactant
a chemical reaction involving substances A and B stops when B is completely used. B is the...?
percentage yeild
a chemist interested in the efficiency of a chemical reaction would calculate the...?
relative numer of moles of reactants and products
coefficients in a chemical equation represent the...?
4.5 g
for the reactant represented by the equation 2Na + 2H2O --> 2NaOH + H2, how many grams of hydrogen can be produced if 120 g of sodium and 80 g of water are available?
188 g
for the reactant represented by the equation Cl2 +2KBr --> 2KCl + Br2, how many grams of potassium chloride can be produced from 300 g each of chlorine and potassium bromide?
575g
for the reaction represented by the equation 2Fe + Ow2 --> 2FeO, how many grams of iron(II) oxide are produced from 8.00mol of iron in an excess of oxygen?
108 g
for the reaction represented by the equation 2H2 + O2 --> 2H2o, how many grams of water are produced from 6.00 mol of hydrogen?
818 g
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 nitric acid, HNO3, and an excess of Mg(OH)2?
5.21 mol
for the reaction represented by the equation 2KIO3 --> 2KCl + 3O2, how many moles of potassium chlorate are required to produce 250. g of oxygen?
120 g
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 water?
70.9 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?
7.0 mol
for the reaction represented by the equation AgNO3 + 3NaCl --> NaNO3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO3?
20 mol
for the reaction represented by the equation C + 2H2 --> CH4, how many moles of hydrogen are required to make 10 mol of methane, CH4?
83.88%
for the reaction represented by the equation CH4 + 2O2 --> 2H2o + CO2, calculate the percentage yield of carbon dioxide if 1000. g 0f methane react with excess oxygen to produce 2300. g of carbon dioxide
6.23 mol
for the reaction represented by the equation CH4 _ 2O2 --> CO2 + 2H2O, how many moles of carbon dioxide are produced from the combination of 100. g of methane?
91.0%
for the reaction represented by the equation Cl2 + 2KBr --> 2KCl + Br2, calculate the percentage yield if 200. g of chlorine react with excess potassium bromide to produce 410. g of bromine
g/mol
the units of molar mass are...?
coefficients
to balance a chemical equation, it may be necessary to adjust the...?
the masses of all products
to determine the limiting reactant in a chemical reaction involving known masses of A and B, one could first calculate...?
available amount of each reactant
to determine the limiting reactant in a chemical reaction, one must know the...?
percentage yeild
what is the ratio of the actual yield to the theoretical yield, multiplied by 100?
reaction stoichiometry
what is the study of the mass relationships among reactants and products in a chemical reaction?
1;2
In the reaction represented by the equation N2 + #H2 --> 2NH3, what is the mole ratio of nitrogen to ammonia?
3:2
In the reaction represented by the equation N2 + 3H2 --> 2NH3, what is the mole ratio of hydrogen to ammonia?
synthesis reaction
In what kind of reaction do two or more substances combine to form a new compound?
2.1 g O3
Ozone, O3, is produced by the reaction represented by the following equation: NO2(g) + O2(g) --> NO9(g) + O3(g) What is the mass of Ozone form from the reaction of 2.0 g of NO2 in a car's exhaust and excess oxygen?
3.0 mol
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 a=gas are required?
theoretical yeild
What is the maximum possible amount of product obtained in a chemical reaction?
Actual yield
What is the measured amount of a product obtained from a chemical reaction?
composition stoichiometry
What is the study of the mass relationships of elements in compounds?
reaction stops
When a limiting reactants in a chemical reaction is completely used, the...?
1,1,2
Which coefficients correctly balance the formula NH4NO2 --> N2 + H2O?
the mass of potassium required to produce a known mass of potassium chloride
Which of the following would be investigated in reaction stochiometry?
1.00 mol
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?
84.2%
for the reaction represented by the equation MG + 2HCl --> 2H2O + MgCl2, calculate the percentage yield of magnesium chloride if 100. g of magnesium reacts with excess hydrochloric acid yield 330. g of magnesium chloride
9.0 mol
for the reaction represented by the equation N2 + 3H2 --> 2NH3, how many moles of nitrogen are required to produce 18 mol of ammonia?
0.904 mol
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?
320 g
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?
mole ratio of D to A from the chemical equation
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...?
the actual yield is equal to the theoretical yield
if the percentage yield is 100%, then...?
4.5 mol
in the equation KClO3 --> 2KCl + 3O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decompose completely?
4:3
in the reaction represented by the equation 2Al2O3 --> 4Al + 3O2, what is the mole ratio of aluminum to oxygen?
3
when the formula equation Fe3O4 + Al --> Al2O3 + Fe is correctly balanced the coefficient of Fe is number...?
stoichiometry
which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in a chemical reaction?
2H2+O2+H2O
which equation is NOT balanced?
the amount of energy required to break the ionic bonds in calcium fluoride
which of the following would NOT be studied in the branch of chemistry called stoichiometry?
limiting reactant
which reactant controls the amount of product formed in a chemical reaction?