Ch.6 - Thermochemistry WorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Sections
Internal Energy
Calorimetry
Thermochemical Equation
Hess's Law
Enthalpy of Formation
End of Chapter 6 Problems
Additional Practice
Units of Energy
Endothermic & Exothermic Reactions
Additional Guides
Enthalpy
LearnAdditional Practice
Next SectionThermochemical Equation

Solution: Be sure to answer all parts.A 0.1775-g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 J/°C. The temperature Increases by 1.452°C. (a) Calcul

Problem

Be sure to answer all parts.

A 0.1775-g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 J/°C. The temperature Increases by 1.452°C. 

(a) Calculate the heat given off by the burning Mg in kJ/g. 

(b) Calculate the heat given off by the burning Mg in kJ/mol. 

Solution
View the complete written solution...
Next
Practice Problems
Two solids of equal mass, labeled X and Y, are pla...
How much energy is required to change the temperat...
The molar heat capacity of silver is 25.35 J/mol•°...
Three separate 3.5g blocks of Al, Cu, and Fe at 25...
Adding water to a steel pan on a flame slows the r...
When a 45.0 g sample of an alloy at 100.0 °C is dr...
Two aqueous solutions are both at room temperature...
Calculate q (in kJ) when 2.00 g of water is heated...
A 1.00 g sample of NH 4NO3 is decomposed in a bomb...
Which substance (with specific heat capacity provi...
If three samples of silver, one with a mass of 10....
When a fresh breath of air is drawn into the lungs...
How much heat is absorbed by a pan made of iron, w...
A student constructs a "coffee cup" calorimeter th...
In a bomb calorimeter, reactions are carried out a...
Determine the specific heat capacity of an alloy t...
When 75.4 J of energy is absorbed by 0.25 mol of C...
Suppose a 50.0 g block of silver at 100°C is place...
Which of the following statements are correct? A....
The combustion of toluene has a ∆Erxn of -3.91 x 1...
If it takes 0.216 kJ of heat to raise the temperat...
A chemistry student weighs a rock and finds its ma...
When 1.550 g of liquid hexane (C6H14) undergoes co...
Determine the final temperature when a 25.0 g piec...
When 68.00 J of energy are added to a sample of Ga...
A 19.78 g piece of nickel (specific heat of nickel...
The specific heat of copper metal is 0.385 J/g K. ...
A student mixes 100 mL of 0.50 M NaOH with 100 mL ...
In constant-volume calorimetry, what is FALSE?   ...
Which substance (with specific heat capacity provi...
More heat is derived from cooling one gram of stea...
A sample of 1.67 grams of compound Y is burned com...
The same reaction in a bomb and coffee-cup calorim...
A total of 2.25 moles of a compound are allowed to...
A piece of iron (mass = 100.0 g) at 398 K is place...
The molar heat capacity of silver is 25.35 J/mol ×...
Which of the following substances (with specific h...
How much energy must be transferred to raise the t...
A 55.0-g piece of metal is heated in boiling water...
A 0.3423 g sample of pentane, C5H12, was burned in...
What is heat capacity?
Explain the difference between heat capacity and s...
Explain how the high specific heat capacity of wat...
Spilling room-temperature water over your skin on ...
What are the units of molar heat capacity?
What are the units of specific heat?
If you know the specific heat of copper, what addi...
What is the specific heat of liquid water?
We pack two identical coolers for a picnic, placin...
Elements C...
Nutrition label for whole milk.Which value woul...
Which releases the greatest amount of energy per g...
Assuming that there is an uncertainty of 0.002 oC ...
What is calorimetry?
Explain the difference between a coffee-cup calori...
Is the change in enthalpy for a reaction an extens...
In order to obtain the largest possible amount of ...
A sample of a hydrocarbon is combusted completely ...
The same reaction, with exactly the same amount of...
Coffee-cup calorimeter. This simple apparatus i...
Bomb calorimeter.Why is a stirrer used in calor...
Hess’s law provides a useful means of calculating ...
Hess’s law provides a useful means of calculating ...
Enthalpy diagram for combustion of 1 mol of met...
What is meant by the term fuel value?
Which is a greater source of energy as food, 5 g o...
If two objects, A and B, of different temperature ...
The fuel in high-efficiency natural gas vehicles c...
Acetylene gas, C2 H2 (g), is used in welding.How m...
Natural gas is very abundant in many Middle Easter...
A coffee-cup calorimeter contains 150.0 g of wate...
A silver block, initially at 57.6 oC, is submerged...
A 31.5 g wafer of pure gold initially at 69.7 oC ...
Two substances, A and B, initially at different te...
A 2.56 g sample of a substance suspected of being...
A 2.56 g sample of a substance suspected of being...
A 26.0 -g aluminum block is warmed to 65.5 oC and...
A coffee-cup calorimeter contains 150.0 g of wate...
To determine whether a shiny gold-colored rock is ...
To determine whether a shiny gold-colored rock is ...
How much heat is required to warm 1.50 L of water...
Suppose that 26 g of each of the following substa...
Suppose that 26 g of each of the following substa...
Suppose that 26 g of each of the following substa...
A house is designed to have passive solar energy f...
From the following data for three prospective fuel...
One tablespoon of peanut butter has a mass of 17 g...
The hydrocarbons acetylene (C2 H2 ) and benzene (C...
The hydrocarbons acetylene (C2 H2 ) and benzene (C...
Three common hydrocarbons that contain four carbon...
Three common hydrocarbons that contain four carbon...
The heat of vaporization of water at 373 K is 40.7...
An ice cube with a mass of 20 g at -20oC (typical ...
The heat of vaporization of water at 373 K is 40.7...
A sample of a hydrocarbon is combusted completely ...
What is the molar heat capacity of liquid water?
What is the heat capacity of 175 g of liquid wate...
How many kJ of heat are needed to raise the temper...
Using information in Appendices B and C in the tex...
A coffee-cup calorimeter contains 150.0 g of wate...
A coffee-cup calorimeter contains 150.0 g of wate...
5.00 moles of an ideal gas are contained in a cyli...
Liquid sodium is being considered as an engine coo...
Which will release more heat as it cools from 50°C...
A sample of copper absorbs 43.6 kJ of heat, result...
If you have 340.0 mL of water at 25.00 °C and add ...
Determine the specific heat capacity of an alloy t...
Calculate the amount of heat (in kJ) necessary to ...
Calculate the amount of heat (in kJ) required to r...
How much heat, in kJ, is required to raise the tem...
A house is designed to have passive solar energy f...
A coffee-cup calorimeter of the type shown in Figu...
A coffee-cup calorimeter of the type shown in Figu...
A coffee-cup calorimeter of the type shown in Figu...
A coffee-cup calorimeter of the type shown in Figu...
To raise 232 g of an unknown liquid from 15°C to 6...
Which one of the following statements is correct?A...
A sample of steam with a mass of 0.510 g and at a ...
Sucrose (table sugar) has the formula C12H22O11 (m...
Suppose a 50.0 g block of silver (specific heat = ...
What is the molar heat capacity of liquid water? E...
NOTE: YOUR ANSWER SHOULD BE IN KJ/MolWhen 0.535 g ...
In a calorimetry experiment a student determines t...
A bar of hot metal is placed in water in an insula...
Two solid objects, A and B, are placed in boiling ...
Given the following balanced equation,2 Na(s) + 2 ...
The specific heat of iron metal is 0.450 J/g-K. Ho...
If a reaction produces 1.506 kJ of heat, which is ...
When a 9.55-g sample of solid sodium hydroxide dis...
A 2.200-g sample of quinone (C6H4O2) is burned in ...
Calculate the amount of heat necessary to raise th...
The two aqueous solutions are not at room temperat...
The specific heat of methanol is 2.5104 J/g.ºC. Ho...
A sample of calcium carbonate [CaCO3 (s)] absorbs ...
It takes 75.0 J to raise the temperature of an 19....
A 2.78g lead weight, initially at 11.0°C, is subme...
Explain the difference between heat capacity and s...
Diluting sulfuric acid with water is highly exothe...
Palmitic acid (C16H32O2) is a dietary fat found in...
Would the amount of heat absorbed by the dissoluti...
Both propane and butane are used as gaseous fuels....
A 1-kg cylinder of aluminum and 1-kg jug of water,...
Two substances A and B, initially at different tem...
Which sample is most likely to undergo the smalles...
Two solid objects, A and B, are placed in boiling ...
Table 5.2Specific Heats of Some Substances at 298 ...
Four 50.0-g samples of different colorless liquids...
Suppose you are cold-weather camping and decide to...
The specific heat of water is 4.184 J/g °c and tha...
Consider the following reaction.2 HCl(aq) + Ba(OH)...
A serving of a particular ready-to-serve chicken n...
What is the change in enthalpy (∆H) for a chemical...
How is ∆H different from ∆E?
Exactly 1.5 g of a fuel is burned under conditions...
Exactly 1.5 g of a fuel is burned under conditions...
Write a balanced equation and draw an enthalpy dia...
Write a balanced equation and draw an enthalpy dia...
Would the amount of heat measured for the reaction...
Would the amount of heat absorbed by the dissoluti...
The specific heat of octane, C8H18 (l), is 2.22 J/...
A 100.0-g bar of gold is heated from 25 oC to 50 o...
If two objects, A and B, of different temperature ...
A 500 mL bottle of water at room temperature and a...
The reactionSO3 (g) + H2O (l) → H2SO4(aq)is the la...
A 45 g aluminum spoon (specific heat 0.88 J/g°C) a...
Two substances, A and B, of equal mass but at diff...
How many kJ of heat are needed to raise the temper...
a. What is the specific heat of liquid water? b. ...
At 1 atm, how much energy is required to heat 55.0...
When 1.551 g of liquid hexane (C6H14) undergoes co...
Which is the least expensive source of energy in k...
In a coffee-cup calorimeter, 1.60 g NH 4NO3 was mi...
Explain how the heat measured in Example 5.5 diffe...
Using the data in the check your learning section ...
Calculate the enthalpy of solution (ΔH for the dis...
A coffee-cup calorimeter initially contains 125 g ...
In a coffee-cup calorimeter, 1.60 g NH4NO3 is mixe...
Consider the reaction2ClF3 (g) +  2NH3 (g) → N2 (g...
You may want to reference (Pages 823 - 825)Section...
Quinone is an important type of molecule that is i...
Syngas can be burned directly or converted to meth...
Ethanol (C2H5OH) has been proposed as an alternati...
Natural gas is very abundant in many Middle Easter...
Methanol (CH3OH) has also been proposed as an alte...
Natural gas is very abundant in many Middle Easter...
Consider the reactionB2H6 (g) + 3O2 (g) → B2O3 (s)...
The heat of vaporization of water at 373 K is 40.7...
The heat of vaporization of water at 373 K is 40.7...
Find ΔE for the change in state of 1.0 mol H2O(l) ...
Find ΔH for the change in state of 1.0 mol H2O(l) ...
If the reaction to form water were writtenlarge{{ ...
Under constant-volume conditions the heat of combu...
When a 3.80-g sample of liquid octane (C8H18) is b...
When 0.515 g of biphenyl (C12H10) undergoes combus...
If 55.0 mL of ethanol (density = 0.789 g/mL) initi...
A block of copper of unknown mass has an initial t...
Two substances, lead and glass (Pyrex), initially ...
A 4.96 g sample of gold, initially at 62.6˚C, is s...
A 32.6 g iron rod, initially at 22.3 oC, is submer...
A 30.0-g sample of water at 280. K is mixed with 5...
How many milliliters of water at 23°C with a densi...
How much will the temperature of a cup (180 g) of ...
A pure gold ring and pure silver ring have a total...
A pure gold ring and pure silver ring have a total...
Two iron bolts of equal mass—one at 100.°C, the ot...
One piece of copper jewelry at 105°C has twice the...
A biology experiment requires the preparation of a...
(a) How much heat is released when 25.0 g of metha...
A 45 g aluminum spoon (specific heat 0.88 J/g°C) a...
A 5.00-g sample of aluminum pellets (specific heat...
The specific heat of water is 4.18 J/(g • °C). Cal...
Substances A and B, initially at different tempera...
A 2.78g lead weight, initially at 11.0°C, is subme...
A 2.51 g lead weight, initially at 10.6˚C, is subm...
One method of generating electricity is by burning...
An unknown mass of each substance, initially at 24...
An unknown mass of each substance, initially at 24...
An unknown mass of each substance, initially at 24...
An unknown mass of each substance, initially at 24...
Consider the substances in Table 7‑1. Which substa...
The specific heat capacity of silver is 0.24 J/°C•...
SubstanceSpecific heatcapacity, Cs (J/(g oC))*Elem...
In a bomb calorimeter, the reaction vessel is surr...
A propane tank on a home barbeque contains 11.3x10...
The bomb calorimeter in Exercise 102 is filled wit...
Calculate the heat capacity, in joules and in calo...
Calculate the heat capacity, in joules and in calo...
Calculate the heat capacity, in joules and in calo...
Suppose that 26 g of each of the following substan...
Calculate the heat capacity, in joules and in calo...
How much heat, in joules and in calories, must be ...
How much heat, in joules and in calories, is requi...
The specific heat capacity of silver is 0.24 J/°C•...
If 14.5 kJ of heat were added to 485 g of liquid w...
Stearic acid (C18H36O2) is a fatty acid, a molecul...
The specific heat capacity of silver is 0.24 J/°C•...
The heat capacity of a bomb calorimeter was determ...
A piece of unknown substance weighs 44.7 g and req...
The combustion of 0.1584 g benzoic acid increases ...
A piece of unknown solid substance weighs 437.2 g,...
A 5.00-g sample of one of the substances listed in...
An aluminum kettle weighs 1.05 kg.How much heat is...
An aluminum kettle weighs 1.05 kg.How much heat is...
It takes 585 J of energy to raise the temperature ...
Use standard enthalpies of formation to calculate ...
Palmitic acid (C16 H32 O2 ) is a dietary fat found...
A sample of nickel is heated to 99.8°C and placed ...
Palmitic acid (C16H32O2) is a dietary fat found in...
Liquid sodium is being considered as an engine coo...
A 295-g aluminum engine part at an initial tempera...
An unknown volume of water at 18.2°C is added to 2...
Find q for the change in state of 1.0 mol H2O(l) a...
Find w for the change in state of 1.0 mol H2O(l) a...
Hydrogen gives off 120. J/g of energy when burned ...
How much heat must be absorbed by a 21.0 g sample ...
The following scenes represent a gaseous reaction ...
Two solid objects, A and B, are placed in boiling ...
Table 5.2Specific Heats of Some Substances at 298 ...
The specific heat of octane, C8H18 (l), is 2.22 J/...
What information about water is needed to calculat...
Microwave ovens use microwave radiation to heat fo...
If the 3.21 g of NH 4NO3 in Example 5.6 were disso...
How much heat is required to warm 1.50 kg of sand ...
Methanol (CH3OH) is used as a fuel in race cars.Yo...
Methanol (CH3OH) is used as a fuel in race cars.Yo...
The automobile fuel called E85 consists of 85% eth...
A swimming pool, 10.0 m by 4.0 m, is filled with w...
A 100.0-g bar of gold is heated from 25 oC to 50 o...
Dry ice is solid carbon dioxide. Instead of meltin...
Assume that the kinetic energy of a 1400 kg car mo...
A calorimeter was used to measure the heat change ...A 2.90 g lead weight, initially at 11.1 ºC, is sub...Exactly 132.6 J will raise the temperature of 10.0...A volume of 110 mL of H_2O is initially at room te...A 31.5 g water of pure gold initially at 69.3 degr...
The specific heat of a certain type of cooking oil...Enter your answer in the provided box.A 479 g samp...The specific heat of a certain type of metal is 0....
If 125 cal of heat is applied to a 60.0-g piece of...
Dry ice is solid carbon dioxide. Instead of meltin...An unknown mass of each of the following substance...If the heat of combustion for a specific compound ...
An 80.0-gram sample of a gas was heated from 25°C ...
A 54.0 g block of an unknown metal is heated in a ...Enter your answer in the provided box. A 595-g pie...When a 2.331-g sample of a new organic material wa...The heat capacity of an object indicates how much ...How much energy must be transferred to raise the t...
Suppose you place 0.0300 g of magnesium chips in a...A 428 g iron weight is added to 425 ml of water in...A piece of cobalt with a mass of 4.28 grams is hea...The propane fuel (C3H8) used in gas barbeques buns...A 129 g metal bar requires 2.50 kJ to change its t...Calculate the heat energy released when 11.9 g of ...If you combine 280.0 mL of water at 25.00°C and 12...An ice cube of mass 8.5 g is added to a cup of cof...A 3.67-g peanut is burned in a bomb calorimeter co...The complete combustion of 0. 731g of a snack bar ...The specific heat of a certain type of metal is 0....A 29.75 g piece of iron and a 23.40 g piece of gol...A 15.99 g sample of metal heated in a test tube su...If the heat of combustion for a specific compound ...
A hot lump of 106.2 g of an unknown substance init...In a constant-pressure calorimeter, 70.0 mL of 0.8...A 30.83 g sample of a substance is initially at 21...Exactly 10.3 mL of water at 31.0 °C are added to a...Liquid sodium is being considered as an engine coo...A 2.97 g lead weight, initially at 10.7 °C is subm...A 49.3-g piece of metal is heated to 288 °C and dr...Two substances, A and B, initially at different te...Calculate the heat capacity of a calorimeter if th...A 59.69 g sample of a substance is initially at 24...The specific heat of a certain type of cooking of ...A 42.41 g sample of a substance is initially at 24...
In the following experiment, a coffee-cup calorime... The temperature of an object increases by 42.4°C ...The specific heat of a certain type of metal is 0....A 34.22 g sample of a substance is initially at 28...A 285 g piece of granite, heated to 6.10 x 102 °C ...Consider the following reaction: NaCl (s) → Na+ (a...An unknown mass of each of the following substance...Four ice cubes at exactly 0°C with a total mass of...How much heat energy is required to raise the temp...The following equation is the balanced combustion ...When a 6.50 g sample of solid sodium hydroxide dis...Enter your answer in the provided box.Calculate th...A 38.40 g sample of a substance is initially at 21...When 2112 J of heat energy is added to 45.8 g of e...Titanium reacts with iodine to form titanium(III) ...What is the sign and magnitude of q when 21.6 g of...The specific heat of a certain type of cooking oil...A 27.72 g sample of a substance is initially at 21...The specific heat of a certain type of metal is 0....Calculate the enthalpy of methanol (CH3OH(l) (MW =...
Typically, water runs through the baseboard copper...An 80 0-gram sample of a gas was heated from 25°C ...Be sure to answer all parts.A 0.1775-g sample of s...Enter your answer in the provided box.A sheet of g...Calculate the amount of heat required to heat a 50...Enter your answer in the provided box.A 25.95-g sa...At 1 atm, how much energy is required to heat 79.0...Suppose you had a bomb calorimeter containing 500 ...When 48.0 J of heat are added to 13.2 g of a liqui...If you combine 370.0 mL of water at 25.00 ° C and ...A 35 gram sample of copper (Csp(Cu) = 0 685 J/(g°C...An 80.0-gram sample of a gas was heated from 25°C ...
A silver block, initially at 56.1°C is submerged i...Heat is applied to change the temperature of a wat...How much heat is needed to raise the temperature o...
When a solid dissolves in water, heat may be evolv...Exactly 10.1 mL of water at 31.0°C are added to a ...If 285 grams of water at 21 °C absorbs 287 kJ of h...The temperature of a sample of iron increased by 2...What is the specific heat of copper if it takes 93...The heat of vaporization of water is 40.66 kJ/mol....Calculate the amount of heat required to raise the...Suppose that 1.14 g of rubbing alcohol (C6H8O) eva...A 26.6 g sample of Au metal (c = 0.13 J/g°C) is he...
Some homes that use baseboard heating use copper t...If 1495 J of heat is needed to raise the temperatu...In the laboratory a "coffee cup " calorimeter, or ...
Zinc metal reacts with hydrochloric acid according...
A researcher studying the nutritional value of a n...A pure sample of pure (E)-2, 5-dimethyl-3-hexene (...The specific heat of solid copper is 0.385 J/(g • ...When a 8.00-g sample of RbBr is dissolved in water...An unknown mass of each of the following substance...Part AIf you used the 8400 kilojoules you expend i...A hot tub is filled with 450 gal of water. (Figure...If you combine 350.0 mL of water at 25.00°C and 11...The heat capacity of an object indicates how much ...An insulated container is used to hold 43.40 g of ...
When a 6.50-g sample of solid sodium hydroxide dis...
The combustion of how many moles of ethane (C2H6) ...Why is it reasonable to assume the specific heats ...
What is the heat capacity of 155 g of liquid water...661 cal of heat is added to 5.00 g ice at -20.0 °C...
A 455-g piece of copper tubing is heated to 89.5°C...
When 1.0 g of fructose, C6H12O6(s), a sugar common...
A 110.-g sample of copper (specific heat capacity ...
Calculate q when 0.10 g of ice is cooled from 10.0...
One of the components of polluted air is NO. It is...
When a 0.740 g sample of trinitrotoluene (TNT), C ...
Mothballs are composed primarily of the hydrocarbo...
An aluminum kettle weighs 1.05 kg.What is the heat...
The temperature of the cooling water as it leaves ...
Evaporating sweat cools the body because evaporati...
Under constant-volume conditions the heat of combu...
A copper cube with an edge measuring 1.57 cm and a...
Calculate ΔHrxn for each of the following reaction...
A 13.0 g sample of granite initially at 82.0 oC is...
When Karl Kaveman adds chilled grog to his new gra...
If a student performs an endothermic reaction in a...
A 27.7-g sample of the radiator coolant ethylene g...
The specific heat of aluminum is 0.900 J/g • °C. H...
The heat of combustion of liquid octane (C8H18) to...
A piece of unknown substance weighs 44.7 g and req...
A piece of unknown solid substance weighs 437.2 g,...
The specific heat of water is 4.18 J/(g⋅∘C). Calcu...
A 150.0-g sample of a metal at 75.0°C is added to ...
A kilogram of aluminum metal and a kilogram of wat...
A 100.0-g bar of gold is heated from 25 oC to 50 o...
During an experiment, a student adds 1.23 g of CaO...
How much would the temperature of 275 g of water i...
When 155 mL of water at 26°C is mixed with 75 mL o...
Find q when 22.0 g of water is heated from 25.0°C ...
A 70.0 g piece of metal at 80.0°C is placed in 100...
A sample of 0.562 g of carbon is burned in oxygen ...
Previous SectionInternal Energy
Next SectionThermochemical Equation