Enthalpy Change

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Questions (197)

What is the molar change in enthalpy when 100g of ice is heated from -72°C to -18.2°C?(cp=37.4 J/k•mol)Would the answer be
1. 4 answers
2. asked by Lauren
3. 1,113 views
The heat released from the combustion of 0.05 g of white phosphorus increases the temperature if 150g of water from 25 C to 31.5
1. 4 answers
2. asked by Heidy
3. 2,380 views
Calculate the enthalpy change (delta H) in kJ for the following reaction.2Al(s) + Fe2O3 (s) ==> 2 Fe(s) + Al2O3(s) use enthalpy
1. 4 answers
2. asked by Kim
3. 3,527 views
Calculate the enthalpy change in kilojoules when 54.7g of MgCO3 decomposes according to the following equation:MgCO3 (s) into
1. 3 answers
2. asked by Mandy
3. 1,803 views
The standard enthalpy change of the reaction:C2H4(g)+H2O(g)=C2H5OH(l) can be calculated from standard enthalpy changes of
1. 4 answers
2. asked by Anonymous
3. 1,111 views
Calculate the enthalpy change (in kJ) associated with the conversion of 25.0 grams of ice at -4.00 °C to water vapor at 109.0
1. 4 answers
2. asked by HT
3. 1,707 views
Calculate the enthalpy change in the reaction of H2 with F2 to produce HF. The H–H and F–F bond energies are 436 and 155
1. 4 answers
2. asked by Erin
3. 1,287 views
When 20.8 g of calcium chloride, CaCl2, was dissolved in water in a calorimeter, the temperature rose from 25.0°C to 37.1°C.
1. 2 answers
2. asked by Glenna
3. 800 views
If the following reaction:NO(g) + 1/2O2(g) NO2(g) has the following enthalpy change: H° = -56 kJ/mol What is the enthalpy of
1. 4 answers
2. asked by Morgan
3. 3,213 views
Use bond enthalpy values to calculate the enthalpy change for the following reaction. Then, label if the reaction is exothermic
1. 4 answers
2. asked by slayrat
3. 113 views
You have been asked to calculate the enthalpy change in the followingreaction: 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s) The
1. 2 answers
2. asked by Brian Giles
3. 194 views
You have been asked to calculate the enthalpy change in the followingreaction: 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s) The
1. 2 answers
2. asked by Brian Giles
3. 117 views
When 15.0 g of sodium nitrate (NaNO3) was dissolved in water in a bomb calorimeter, the temperature reduced from 25.00 °C to
1. 2 answers
2. asked by ezile
3. 102 views
When 15.0 g of sodium nitrate (NaNO3) was dissolved in water in a bomb calorimeter, the temperature reduced from 25.00 °C to
1. 2 answers
2. asked by ezile
3. 89 views
When a 7.50 g sample of solid NaOH dissolves in100.00 g of water in a coffee-cup calorimeter, the temperature rises from 21.6°C
1. 2 answers
2. asked by ezile
3. 138 views
The average bond enthalpy for C__H is 413 kJ/mol. In other words, 413 kJ of energy is required to break a mole of CH into atoms:
1. 1 answer
2. asked by sarah
3. 1,041 views
Calculate the enthalpy change for the reaction P4O6 + 2O2 -> P4O10 using the information belowP4 + 3O2 -> P4O6 ΔH= -1640.1 kJ
1. 2 answers
2. asked anonymously
3. 61 views
S(rhombic)+O2(g)--->SO2(g)change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1.
1. 4 answers
2. asked by Annabelle
3. 4,336 views
Part ACalculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol)
1. 7 answers
2. asked by tina
3. 17,671 views
You wish to know the enthalpy change for the formation of liquid PCl3 from the elements shown below.P4(s) + 6 Cl2(g)--> 4
1. 4 answers
2. asked by Kat
3. 5,892 views
1. How much heat is released when 9.22 grams of glucose C6H12O6 reacts according to the following equation?C6H12O6 + 6O2 -->
1. 4 answers
2. asked by lea
3. 2,563 views
Please helpSuppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as
1. 5 answers
2. asked by Help
3. 3,428 views
Given H2(g) + (1/2)O2(g) --> H2O, ∆Hº = -286 kJ/mol, determine the standard enthalpy change for the reaction 2H2O(l) -->
1. 4 answers
2. asked by Anon
3. 7,659 views
From the following data at 25°C,H2(g) + Cl2(g) → 2HCl(g) ΔH0 = −185 kJ 2H2(g) + O2(g) → 2H2O(g) ΔH0 = −483.7 kJ
1. 4 answers
2. asked by walter
3. 5,164 views
N2 + O2 -> 2NO enthalpy change = +180.6kJc) what is the enthalpy change for the formation of one mole of nitrogen monoxide?
1. 4 answers
2. asked by A Canadian
3. 1,679 views
Calculate the enthalpy change when 100. g of ice at 0.0 °C is heated to liquid water at 50.0°C. (The heat of fusion for water
1. 6 answers
2. asked by Robert
3. 2,553 views
What is the enthalpy change for the first reaction?Fe2O3(s) → 2Fe(s) + 3/2O2(g) ΔH = 4Fe(s) + 3O2(g) → 2Fe2O3 (s) ΔH =
1. 4 answers
2. asked by Hahn
3. 7,016 views
Enthalpy ChangeGiven the following reactions: S(s) + O2(g) → SO2(g) ΔH = -297 kJ/mol SO2(g) + ½ O2(g) → SO3(g) ΔH = -141
1. 4 answers
2. asked by chem_01
3. 3,250 views
In a constant-pressure calorimeter, 60.0 mL of 0.330 M Ba(OH)2 was added to 60.0 mL of 0.660 M HCl. The reaction caused the
1. 4 answers
2. asked by Heather
3. 823 views
Calculate the standard enthalpy change for the reaction 2C8H18(l)+17O2(g)> 16CO(g) + 18H2O(l)Given
1. 4 answers
2. asked by Nicole
3. 4,132 views
Calculate enthalpy change of reaction for the combustion of gaseous ethanol.C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar
1. 4 answers
2. asked by Alex
3. 5,245 views
Aluminum metal can be produced by reducing solid aluminum oxide (Al2O3) with carbon (graphite). Carbon monoxide is the other
1. 4 answers
2. asked by Johnny
3. 860 views
Can anyone help me with these Chemistry questions? I am trying to study for an upcoming test and its just not sinking in as well
1. 4 answers
2. asked by Dina
3. 1,230 views
With a platinum catalyst, ammonia will burn in oxygen to give nitric oxide, NO.4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g) ÄH = -906
1. 3 answers
2. asked by Glenna
3. 1,340 views
Calculate the enthalpy change for the reaction:2S(s) + 3O2(g) --> 2SO3(g) Use the following thermochemical equations: Reaction
1. 4 answers
2. asked by Jordin
3. 7,261 views
Calculate ∆H0for the reaction 2 N2(g) + 5 O2(g) −→ 2 N2O5(g) given the data H2(g) + 1 2 O2(g) −→ H2O(ℓ) ∆H0 f =
1. 4 answers
2. asked by dayana
3. 2,960 views
sucrose change of H is -2226.1kj/molfructose change of H is -1265.6KJ/mol calculate the enthalpy change for the hydrolysis
1. 4 answers
2. asked by mar
3. 2,624 views
What is the approximate ΔH in kJ for the following reaction as written:2NH3(g) --> 3H2(g) + N2(g) Careful, what kind of bond
1. 4 answers
2. asked by Bob
3. 804 views
When 23.6 of calcium chloirde CaCl2 was dissolved in water in a calorimeter, the temperature rose from 25.0 degrees C to 21.56
1. 4 answers
2. asked by Lauren
3. 2,505 views
calculate the enthalpy change for the allotropic transformation of sulphur in the monoclinic form to sulphur in the rhombic form
1. 3 answers
2. asked by nandhu
3. 2,577 views
Calculate the standard enthalpy change for the reaction2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -251 B
1. 4 answers
2. asked by Miranda
3. 2,978 views
calculate the enthalpy change for the following (unbalanced equation) assume all reactants and products are in their standard
1. 4 answers
2. asked by hrithik
3. 856 views
Given the following equations:2 H2 (g) + O2 (g)--> 2 H2O (l) deltaH = -571.6 kJ N2 (g) + O2 (g)-->2 NO (g) deltaH = +180.5 kJ N2
1. 3 answers
2. asked by Katherine
3. 1,862 views
Enthalpy questions?Given this enthalpy change MgCl₂(s)---->Mg²⁺(g) +2Cl⁻(g) ΔH∅ =+2490KJ/mol Mg2+(g)----> Mg²⁻ (aq)
1. 4 answers
2. asked by Arvind Vijayanand Dubey
3. 1,240 views
When a chemist burns hydrogen sulfide according to the reaction below she finds that the reaction releases heat. (It is
1. 5 answers
2. asked by Oakley
3. 759 views
Calculate the standard enthalpy change for the reaction:2C8H18(l) + 17O2(g) --> 16CO(g) + 18H2O(l) Given: 2C8H18(l) + 25O2(g)
1. 3 answers
2. asked by Anon
3. 2,048 views
How many kilojoules are released when 130 g of Si reacts with chlorine?Si(s)+2Cl2(g)→SiCl4(g)ΔH=−657kJ
1. 3 answers
2. asked by Cara
3. 2,412 views
Assuming that kerosene is C11H24, calculate the standard enthalpy change when 1 mole of kerosene burns completely in oxygen,
1. 3 answers
2. asked by Ava
3. 1,008 views
In a calorimetric experiment, 6.48 grams of lithium hydroxide was dissolved in water. The temp of the calorimeter rose from 25
1. 3 answers
2. asked by k-dawg
3. 1,006 views
HNO3 (g) + 4H2 (g) ---> NH3 (g) + 3H2O (g) deltaH = -637 kJCalculate the enthalpy change when one mole of hydrogen reacts; and
1. 4 answers
2. asked by Anonymous
3. 1,272 views

Enthalpy Change

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