Unit 4 Review
How many moles of NaOH are required to react completely with 1.00 mole of nitric acid? (Hint: begin by writing a balanced equation)
1.00 mol
The equation for the combustion of carbon to carbon monoxide is given below. C(s) + O2(g) → CO(g) In a balanced equation, the coefficients are, in order,
2, 1, 2
The equation for the combustion of water is given below. H2(g) + O2(g) → H2O(l) In a balanced equation, the coefficients are, in order,
2, 1, 2
The equation for the combustion of octane is given below. C8H18(l) + O2(g) → CO2(g) + H2O(l) In a balanced equation, the coefficients are, in order,
2, 25, 16, 18
When a salt is dissolved in water, it is represented by the following notation in a chemical reaction?
(aq)
What is the oxidation number of Cr in a dichromate anion?
+6
What is the oxidation number of Mn in a permanganate anion?
+7
A 0.125 g sample of unknown hydrocarbon is prepared for combustion analysis. After the hydrocarbon undergoes complete combustion, 0.4225 g of CO2 and 0.0865 g of H2O are produced. What is the empirical formula of the unknown?
0.0500 M
How many moles of sulfuric acid are required to react completely with 1.00 mole of sodium hydroxide? (Hint: begin by writing a balanced equation)
0.500 mol
Calculate the amount of CO2 produced when 1.00 mole of propane (C3H8) is burned in the presence of 1.00 mole of oxygen. C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
0.600 mol
When the following equation is balanced, the coefficient for N2 is ______. N2(G) + H2(G) →NH3(G)
1
The equation for the combustion of methane is given below. CH4(g) + O2(g) → CO2(g) + H2O(l) In a balanced equation, the coefficients are, in order,
1, 2, 1, 2
The equation for the combustion of propane is given below. C3H8(g) + O2(g) → CO2(g) + H2O(l) In a balanced equation, the coefficients are, in order,
1, 5, 3, 4
The complete combustion of sulfur is represented below. S8(s) + O2(g) → SO2(g) In a balanced equation, the coefficients are, in order,
1, 8, 8
How many moles of HCl are needed to completely react with 50.0 mL of 0.250 M NaOH solution?
1.25 x 10-2 moles
A flask contains 4.00 g of solid sodium hydroxide. Some water is added to the flask to dissolve the sodium hydroxide, and enough water is added to fill the flask to a volume of 50.0 mL. What volume of 1.00 M HCl is needed to neutralize the sodium hydroxide?
100.0 mL
Sulfuric acid (H2SO4) is one of the most widely used chemicals in industrial processes. SO3(g) + H2O(l) → H2SO4(l) Calculate the mass of sulfuric acid produced upon the complete reaction of 100.0 kg of sulfur trioxide.
122.5
If 250.3 L of hydrogen gas (d = 0.0899 g/L) reacts with an excess of nitrogen gas, what mass of ammonia would be produced?
127 g
As mentioned on the web site of National Propane Association, Propane is more than just outdoor grills. Within the commercial, industrial, and agricultural sectors are many markets in which propane gas is being used. In fact, there are hundreds of uses of propane..... Calculate the mass of CO2 produced when 1.00 mole of propane (C3H8) is burned in excess of oxygen.
132 g
Assume for this problem that 20 drops exactly equal 1 mL. A student places 2 drops of 12.0 M HCl in a test tube. How many drops of water must she add to the test tube to obtain a solution in which HCl has a concentration of 1.20 M?
18 drops
When the equation below is balanced, H2O2(aq) + H+(aq) + Fe2+(aq) ⟶ H2O(l) + Fe3+(aq) The coefficient for Fe2+ is
2
When the equation below is balanced, H2O2(aq) + H+(aq) + Fe2+(aq) ⟶ H2O(l) + Fe3+(aq) The coefficients for H+ is
2
What is the complete ionic equation for the reaction between iron(III) bromide and barium hydroxide?
2 FeBr3(aq) + 3Ba(OH)2(aq) → → 2Fe(OH)3(s) + 3BaBr2(aq)
A flask contains 4.00 g of solid sodium hydroxide. Some water is added to the flask to dissolve the sodium hydroxide, and enough water is added to fill the flask to a volume of 50.0 mL. What is the concentration of sodium hydroxide?
2.00 mol/L
How many moles of NaOH are required to react completely with 1.00 mole of sulfuric acid?
2.000 mol
Ozone, O3, is a product in automobile exhaust by the reaction represented by the equation NO2(g) + O2(g) --> 3NO(g) + O3(g). What mass of ozone is predicted to form from the reaction of 2.0 g NO2 in a car's exhaust and excess oxygen?
2.1 g O3
Which of the following is a precipitation reaction?
2NaOH(aq) + MgCl2(aq) --> 2 NaCl(aq) + Mg(OH)2(s)
The combustion of propane produced 8.53 g of carbon dioxide. What mass of propane is required if the yield is 93 %.
3.06 g
How many moles are in 4.50 g of Na2SO4?
3.17 x 10-2 moles
How many moles of NaOH are needed to neutralize 15.0 mL of 0.235 M HCl solution?
3.53 x 10-3 moles
A reaction with an unknown theoretical yield was carried out and the amount of product obtained was a third of the theoretical yield. What is the percent yield?
33.3 %
For the reaction given below, calculate the mass in g of water produced upon complete reaction of 32.0 g of oxygen. 2H2(g) + O2(g) → 2H2O(l)
36.0
The combustion of 0.1240 kg of propane in the presence of excess oxygen produces 0.3110 kg of carbon dioxide. What is the theoretical yield?
371.2 g
The equation for the reaction of iron with oxygen is shown below. Fe(s) + O2 → Fe2O3(s) In a balanced equation, the coefficients are, in order,
4, 3, 2
How many moles of KOH are needed to neutralize 35.0 mL of 0.115 M HNO3 solution?
4.03 x 10-3 moles
How many grams of carbon dioxide can form when a mixture of 4.41 g propane (C3H8) and 6.40 g of oxygen (O2) is ignited, assuming complete combustion to form carbon dioxide and water. The balanced equation is: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
5.28 g
What is the mass of ammonium chloride is 500.0 mL of a 0.198 M solution?
5.30 g
What mass of ammonia is required to completely react with 12.8 g of oxygen gas to form nitric oxide? 4NH3+5O2→4NO+6H2O
5.45 g
If 1.50 moles of nitrogen gas reacts with an excess of hydrogen gas, what mass of ammonia would be produced?
51.1 g
The equation for photosynthesis, in which water and carbon dioxide are converted to glucose (C6H12O6) and molecular oxygen (O2), is given below. H2O(l) + CO2(g) → C6H12O6(s) + O2(g) In a balanced equation, the coefficients are, in order,
6, 6, 1, 6
When the following equation is balanced, the coefficient for O2 is ______. NH3(g) + O2(g) → → NO2(g) + H2O(l)
7
The production of ammonia (NH3) from nitrogen and hydrogen, shown below, was an important breakthrough resulting in Nobel prizes in chemistry to Fritz Haber (1918) and Carl Bosch (1931). This compound is widely used in manufacturing fertilizers. 3H2(g) + N2(g) → 2NH3(g) Calculate the mass of nitrogen (in kg) needed to manufacture 1000 kg of ammonia. Assume four significant figures.
822.4
The combustion of butane produced 0.0243 kg of carbon dioxide. What mass of butane is required if the yield is 89 %.
9.01 g
The combustion of 0.136 kg of methane in the presence of excess oxygen produces 353 g of carbon dioxide. What is the percent yield?
94.6 %
This is a continuation of a previous problem. A mixture of 4.41 g propane (C3H8) and 6.40 g of oxygen (O2) is ignited. What reactant is in excess and by how much assuming complete combustion to form carbon dioxide and water. The balanced equation is: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
C3H8 is in excess by 2.65 g
A 3.00 g sample of unknown hydrocarbon is prepared for combustion analysis. After the hydrocarbon undergoes complete combustion, 8.80 g of CO2 and 5.40 g of H2O are produced. What is the empirical formula of the unknown?
CH3
Propane is used as a fuel source on many barbeque grills. What is undergoing oxidation during the burning of propane while grilling?
CH3CH2CH3
Which is the reducing agent in the combustion of methanol?
CH3OH
What is the net ionic equation for the reaction between CoCl2 and an alkali hydroxide?
Co2+(aq) + 2OH-(aq) → → Co(OH)2(s)
The reaction between hydrogen and oxygen is shown below. In an experiment, 1.0 mole of hydrogen and 1.0 mole of oxygen are introduced in a reaction vessel. What is the limiting reactant?
H2
Hydrogen and oxygen react to form water. Consider the mixture of hydrogen and oxygen shown below. The filled circles represent oxygen and the open circles represent hydrogen. Select the correct statement.
H2 is in excess by 1 molecule
Write a balanced reaction for the neutralization of HBr upon the addition of KOH.
HBr(aq) + KOH(aq) --> KBr(aq) + H2O(l)
Which of the following is an acid-base reaction?
HClO4(aq) + NaOH(aq) --> NaClO4(aq) + H2O(l)
Propane is used as a fuel source on many barbeque grills. What is undergoing reduction during the burning of propane while grilling?
O2
Which is the oxidizing agent in the combustion of methanol?
O2
Write the net ionic equation for a reaction between lead(II) sulfate and sodium iodide.
Pb2+(aq) + 2I-(aq) --> PbI2(s)
Which of the following is a redox reaction?
Zn(s) + 2 HCl(aq) --> ZnCl2(aq) + H2(g)
Which of the following is a method used to allow scientists to determine an empirical formula and identify an organic compound by combusting a sample and the resulting combustion products are quantitatively analyzed?
combustion analysis
The chemical reaction CaCO3 --> CaO + CO2 is classified as a
decomposition reaction
The combustion of 8.0 g of methane in the presence of excess oxygen produces 19.5 g of carbon dioxide. What is the limiting reactant?
methane
What is the correct name for the precipitate formed when mixing potassium carbonate and nickel(II) chloride?
nickel(II) carbonate
What precipitate forms when mixing copper(II) sulfate and sodium sulfate?
no precipitate forms
What precipitate forms when mixing silver(I) nitrate and sodium chloride?
silver(I) chloride
Fewer steps are required to solve stoichiometry problems when
the amount of reactant is given in moles and the product is sought in moles.
