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Enthalpy
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Questions (315)
a 4.50 sample of LiCl at 25.0*C dissolves in 25.0 mL of water also at 25.0*C. The final equilibrium temperature of resulting
1 answer
asked by
bill
471 views
The mass of metal that burns to produce an enthalpy change of -9.00*10^4 kJ
3 answers
asked anonymously
21 views
Determine the molar enthalpy of reaction for the reaction of magnesium with hydrochloric acid.
3 answers
asked anonymously
50 views
Given that:
2Al(s)+(3/2)O2(g)--->Al2O3(s) change in H(rxn)= -1601 kJ/mol 2Fe(s)+(3/2)O2(g)--->Fe2O3(s) change in H(rxn)= -821
3 answers
asked by
Lucy
1,618 views
A total of 2.00 mol of a compound is allowed to react in a foam coffee cup that contains 167 g of water. The reaction caused the
2 answers
asked by
Michelle
501 views
When A + B --> C then this reaction occurs in water, heat is given off.
1) Will the temperature of water go up or go down ? - is
5 answers
asked by
Anonymous
502 views
Determine the amount of heat (in kJ) given off when 2.23 multiplied by 104 g of ammonia are produced according to the following
2 answers
asked by
Tanisha
513 views
Help me! Express your answers in kJ/mol!!
Use Hess's Law to find ΔH for the following reactions: Express your answers in kJ/mol
5 answers
asked anonymously
58 views
i have one more question:
I know this one has to do with hess's law but i'm not sure of how to get the enthalpy of vaporization
3 answers
asked by
maryanne
637 views
Consider these reactions, where M represents a generic metal.
2M(s)+6HCl(aq)⟶2MCl3(aq)+3H2(g)Δ𝐻1=−901.0 kJ
3 answers
asked anonymously
42 views
How do you find [delta]Hvap?
2 answers
asked by
James
497 views
When 0.975 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 400C is observed.
Assume the solution's
4 answers
asked by
Anonymous
604 views
The enthalpy change for reaction N2 + 3H2(g) → 2NH3(g) is 92.2kJ. The enthalpy of formation of ammonia is
a) –92.2 kJ b)
3 answers
asked anonymously
40 views
Which of the following is the best definition of Hess' Law?
A. Heat is always released by the decomposition of 1 mole of a
1 answer
asked by
christine
589 views
what is the enthalpy change in kilojoules for the combustion of 1 mol of ethanol, C2H5OH (l), to form gaseous carbon dioxide and
3 answers
asked by
Sienna
1,481 views
17. You have the following equations:
2S (s) + 3O2 (g) 2SO3 (g), H = 792 kJ 2S (s) + 2O2 (g) 2SO2 (g), H = ? 2SO2 (g) + O2 (g)
3 answers
asked by
JoJo
2,968 views
H2 + F2--> 2HF deltaH = 518.0 kJ
H2 ----> 2H deltaH = 436.8 kJ F2 ---> 2F deltaH = 158.2 kJ (a) calculate Delta H for H + > HF
4 answers
asked by
jessica
2,427 views
Find the enthalpy for : 4Fe + 3O2 = 2Fe2O3
I got the following informations: Fe + 3H2O = Fe(OH)3 + 3/2H2 - Enthalpy is 160.9 kj
3 answers
asked by
Shadow
2,345 views
Consider the following data.
DeltaHf (Na2O (s))=-414kJ/mol Delta H sublimation(Na)=109 kJ/mol I.E. (Na)=495 kJ/mol Bond Energy
4 answers
asked by
Anon
2,234 views
The value of ΔH° for the reaction below is - 6535 kJ. __________ kJ of heat are released in the combustion of 16.0 g of
C6H6(l)
3 answers
asked by
Anonymous
2,092 views
Calculate ΔHrxn for the following reaction:
CaO(s)+CO2(g)→CaCO3(s) Use the following reactions and given ΔH′s.
3 answers
asked by
Hema
2,094 views
How much heat is liberated when 0.113 mole of sodium
reacts with excess water according to the following equation? DH = -368
4 answers
asked by
naik
1,969 views
The complete combustion of butane, (g) is represented by the equation
C4H10+ 13/2O2->4CO2+5H2O standard enthalpy is -2877kj How
3 answers
asked by
tomi
2,001 views
Given 2Al(s) + 3/2O2(g) → Al2O3(s), ΔH°f = -1,670 kJ/mol for Al2O3 (s). Determine ΔH° for the reaction 2Al2O3(s) →
4 answers
asked by
Chris
1,819 views
2BrF3(g)Br2(g) + 3F2(g) STANDARD ENTHALPY?
3 answers
asked by
KD
1,696 views
Given the following reactions
Fe2O3(s) + 3CO (s) → 2Fe (s) + 3CO2(g)ΔH =-28.0 kJ 3Fe (s) + 4CO2(s) → 4CO (g) +Fe3O4(s) ΔH =
4 answers
asked by
Anonymous
1,735 views
The phrase “the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure” is
a.
4 answers
asked by
Jessica
1,644 views
What is the enthalpy for reaction 1 reversed?
reaction 1 reversed: 2CO2+3H2O=C2H5OH+3O2 express the answer in kJ/mol
3 answers
asked by
Lilit***
1,595 views
Given the following heats of combustion.
CH3OH(l) + 3/2 O2(g) CO2(g) + 2 H2O(l) ΔH°rxn = -726.4 kJ C(graphite) + O2(g) CO2(g)
3 answers
asked by
Ellie
1,540 views
AT 25 DEGREES CELSIUS THE STANDARD ENTHALPY OF COMBUSTION OF GASEOUS PROPANE IS -2219.0 KJ PER MOLE OF PROPANE AND THER STANDARD
3 answers
asked by
Anonymous
1,522 views
Which of the following is the best definition of Hess' Law?
A. Since enthalpy is a state function, it will be different if a
4 answers
asked by
Anonymous
1,466 views
From the following data, calculate ΔH° for the reaction
O3(g) +NO(g)----->O2(g)+NO2 (g) Compound ΔH°f (kJ/mol) O3 142.7 NO
3 answers
asked by
Onye
1,417 views
At standard pressure, ammonia melts at 195 K and boils at 240 K. If a sample of ammonia at standard pressure is cooled from 200
4 answers
asked by
please help !
1,417 views
Consider the combustion of propane:
C3H8(g)+5O2(g) yields 3CO2(g) + 4H2O(l) delta H= -2221 kJ Assume that all of the heat comes
3 answers
asked by
Shellby
1,423 views
Calculate the enthalpy change per gram for the combustion of ethane (C2H6(g)).
3 answers
asked by
Billy
1,357 views
Calculate ∆H˚ for the following reaction using the given bond dissociation energies.
CH4 (g) + 2O2 (g) --> CO2 (g) + 2H2O (g)
3 answers
asked by
Raj
1,369 views
A scientist measures the standard enthalpy change for the following reaction to be -172.4 kJ :
2SO2(g) + O2(g) 2SO3(g) Based on
2 answers
asked by
jojo
1,306 views
The enthalpy of formation of MX is ΔHf° = –493 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 143 kJ/mol. The
2 answers
asked by
megan
1,239 views
Consider the following reaction:
H2(g) + I2(s) ---> 2HI(g) TriangleH = 51.9 kj (enthalpy) Calculate the standard enthalpies of
2 answers
asked by
Sandy
1,213 views
Calculate the enthalpy of change, Delta H of rxn, for each of the reactions. record the values in the data table part 2
I
4 answers
asked by
AP Chemistry Question
1,190 views
Find the enthalpy change of the following reactions 2C+2H2O---> CO2+CH4
Using the following reactions with their change in H
1 answer
asked by
Anonymous
1,173 views
2M +6HCl–>2MCl+3H2 Delta H= -638.0 Kj
HClg—>HCl aq= Delta H -74.8 Kj H2+Cl2–>2HCl Delta H -1845.0 Kj MCl3s–> MCl3 aq
1 answer
asked by
Raul
1,164 views
what is the molar enthalpy change when 147 g of water cools from 90.0 degrees C to 17.0 degrees C
2 answers
asked by
sam smith
1,114 views
During an experiment, a student adds 1.23 g of CaO to 200.0 mL of 0.500 M HCl. The student observes a temperature increase of
2 answers
asked by
imstupid
1,131 views
A total of 2.00 mol of a compound is allowed to react in a foam coffee cup that contains 141 g of water. The reaction caused the
4 answers
asked by
Karen
1,114 views
Change in enthalpy problem. Consider the reaction represented below. Referring to the data in the table below, calculate the
6 answers
asked by
Dan
1,130 views
What is the standard heat of reaction (Delta H^0) for the decomposition of hydrogen peroxide?
2H2O2 (l) ==> 2H2O (l) + O2(g)
1 answer
asked by
Jack
1,096 views
Consider the following equation:
4B(s) + 3O2 (g) → 2B2O3 (s) ΔH = - 2509.1 kJ How much heat (in kJ) is transferred when 989 mg
2 answers
asked by
Sarah
999 views
1.Calculate the enthalpy change (ΔHºrxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is
2 answers
asked by
Cha-Ching
1,005 views
Dr.Bob, this is regarding to the enthalpy posts....
I don't understand why you just switch it to negative??How do you know that
2 answers
asked by
Anonymous
964 views
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Parent Categories (15)
Chemical Bonding
Chemical Equations
Chemical Reactions
Chemical Reactions/Thermodynamics
Chemistry
Combustion Reactions
Energy
Heat Transfer
Organic Chemistry
Physical Chemistry
Reaction
Reactions
Stoichiometry
Thermochemistry
Thermodynamics