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Newest Enthalpy Questions

1. The standard reaction of enthalpy for the hydrogenation ofpropene, CH2CHCH3 (g) + H2 (g) → CH3CH2CH3 (g) is -124 kJ/mol. The
   1. 1 answer
   2. 100 views
2. For each problem, find the ΔH for the target reaction below, given the following step reactions and subsequent ΔH values:Targe
   1. 1 answer
   2. asked by Carmen
   3. 145 views
3. 1. The value of ΔH° for the reaction below is -6535 kJ._________ kJ of heat are released in the combustion of 16.0 g C6H6 (l).
   1. 1 answer
   2. asked by Jess
   3. 1,538 views
4. Calculate the change in enthalpy of a superheated steam at 700 psia and 680°F is expanded at constant entropy to 140 psia.
   1. 0 answers
   2. asked by ligas
   3. 491 views
5. Given these reactions :X(s) + 1/2O2(g) --> XO(s) (Delta)H= -707.7 kj XCO3(s) --> XO(s)+CO2(g) (Delta)H= +381.9kj What is
   1. 1 answer
   2. asked by anon
   3. 6,531 views
6. If the ΔH for H2O(l) → H2O(s) is -6.01 kJ, then what is the ΔH for 2H2O(s) → 2H2O(l)?A -6.01 kJ B. 6.01 kJ C. -12.02 kJ D.
   1. 1 answer
   2. asked by Leanne
   3. 560 views
7. EnthalpyI'm given that the heat of reaction for the combustion of ethane is -1560kJ/mol. I need to figure out how much heat is
   1. 0 answers
   2. asked by Justin
   3. 794 views
8. How much does the molar enthalpy change when 147g of water cools from 90°C to 17.0°C? The molar heat capacity for water is
   1. 2 answers
   2. asked by Gino
   3. 978 views
9. Consider the following data.DeltaHf (Na2O (s))=-414kJ/mol Delta H sublimation(Na)=109 kJ/mol I.E. (Na)=495 kJ/mol Bond Energy
   1. 2 answers
   2. asked by Anon
   3. 2,337 views
10. When 1mol of a gas burns at constant pressure, it produces 2430J of heat and does 5kJ of work.Calculate change in H, q, and in
    1. 4 answers
    2. asked by Vanessa Ozuna
    3. 4,078 views
11. Use standard enthalpies of formation to determine ΔHorxn for:2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) Enter in kJ.
    1. 1 answer
    2. asked by jESS
    3. 1,196 views
12. Use standard enthalpies of formation to determine ΔHorxnfor:3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) -133.5 = Delta H Find the
    1. 1 answer
    2. asked by Steve
    3. 3,970 views
13. I need help I can't seem to get the right answer. Please help!1/2 H_2 (g) + 1/2 Cl_2 (g) --> HCl (g) -92.3 kJ/mol Na(s) + 1/2
    1. 1 answer
    2. asked by Alex
    3. 551 views
14. Given that:H2 (g) + F2 (g) ---> 2HF (g) H(rxn)= -546.6 kJ 2H2 (g) + O2 (g) ---> 2H2O (l) H (rxn)= -571.6 kJ calculate the value
    1. 3 answers
    2. asked by Chelsea
    3. 2,453 views
15. 1. The total enthalpy of 15.000kg of steam at 2250.000kPa is 34191.510kJ. Determine the dryness of the steam.ANS = % 2.
    1. 0 answers
    2. asked by Danny
    3. 476 views
16. The phrase “the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure” isa.
    1. 3 answers
    2. asked by Jessica
    3. 1,753 views
17. Can someone check my answers please?I had specific trouble with 7, 13, and 27 (I'm pretty sure my other answers are correct;
    1. 0 answers
    2. asked by a Canadian
    3. 762 views
18. What is the value of q when 8.21g of water vaporizes at 373 K? The enthalpy of condensation of water at 373 K is -40.7 kJ/mol.I
    1. 2 answers
    2. asked by Sarah
    3. 3,241 views
19. The standard enthalphies of formation of ozone, O3(g), and oxygen atoms are +142.70 and +249.17 kJ/mol. Calculate the reaction
    1. 1 answer
    2. asked by Sam
    3. 1,175 views
20. The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1.000 g glucose is combusted in a bomb calorimeter. If the
    1. 3 answers
    2. asked by Kyle
    3. 3,234 views
21. 1.Calculate the enthalpy change (ΔHºrxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is
    1. 1 answer
    2. asked by Cha-Ching
    3. 1,136 views
22. vapor enthalpy energies kj/mol 40.66, specific heat capacities j/g degrees c s(s) 2.1, fus 6.01 enthalpy energies kj/mol 6.01
    1. 0 answers
    2. asked by paula
    3. 594 views
23. standard enthalpies of formationH20(l) = -286 LiOH(s) = -487 standard enthalpies of solution for LiOH(s) to split into it's ions
    1. 1 answer
    2. asked by Gemma
    3. 1,658 views
24. Explain why the calculated value for the (1) enthalpy of combustion for propane using bond energies (bond breaking and bond
    1. 0 answers
    2. asked by Leah
    3. 668 views
25. 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
    1. 1 answer
    2. asked by Michelle
    3. 587 views
26. A substance has a heat of fusion of 61.5 kj/mol and a heat of deposition of 167.4 kj/mol. What is 175 heat of sublimation in
    1. 0 answers
    2. asked by Jim
    3. 739 views
27. Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile,
    1. 0 answers
    2. asked by Mark
    3. 654 views
28. use the table below to calculate ΔHo reaction:Standard Enthalpies of Formation, ΔH˚fٍ at 298 K Substance - Formula -
    1. 1 answer
    2. asked by Sam
    3. 2,236 views
29. 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. 0 answers
    2. asked by christine
    3. 703 views