How to use Hess's Law to calculate enthalpy for the reaction?
Let’s learn how to use Hess's Law to calculate enthalpy for the reaction. The most accurate or helpful solution is served by Yahoo! Answers.
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Use Hess's law and the measured mean enthalpy changes for the NaOH-HCl and NH3-HCl reactions to calculate the enthalpy change to be expected for the reaction? NaOH + NH3Cl ------> NaCl + NH3 + H2O Compare your experimental value with the one you have just calculated. The correct value is only -3.9KJ/mol. Try to explain any disrepency between the eperimental and calculated values and between these values and the correct value?
Answer:
(1) NaOH + HCl ===> NaCl + H2O /\H = x (2) NH3 + HCl ===> NH4Cl /\H = y x and y are minus-numbers...
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Other solutions
Given the thermochemical equations H2 (g) + Br2 (g) => 2HBr (g) deltaH = -72 kJ H2 (g) => 2H (g) deltaH = 436 kJ Br2(g) => 2Br (g) deltaH = 224 kJ calculate the enthalphy change for H(g) + Br (g) => HBr (g) also if you could also solve this...
Answer:
we have to calculate delta H for : H + Br ------> HBr let, H2 + Br2 -----> 2HBr ......delta H...
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Methanol (wood alcohol) is extremely useful as a fuel, as a solvent, and as an antifreeze. However, it is also extremely poisonous; your body changes it into formaldehyde and formic acid after it is ingested. Drinking as little as 10 mL will cause permanent...
Answer:
First reverse the first equation and get CO2 + H2O-->CH3OH + 1.5O2 delta H=+726.4kj/mol Next double...
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Consider the following data. N2(g) + O2(g) 2 NO(g) ΔH = +180.7 kJ 2 NO(g) + O2(g) 2 NO2(g) ΔH = -113.1 kJ 2 N2O(g) 2 N2(g) + O2(g) ΔH = -163.2 kJ Use Hess's law to calculate ΔH for the reaction below. N2(g) + 2 O2(g) 2 NO2(g)...
Answer:
You only need to use the first two equations. NO is a catalyst because it is a product in the first...
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Use Hess's law and the following equations to calculate ΔH for the reaction N2(g) + 2O2(g) N2O4(g). (Show your work.) 2NO2(g) N2O4(g) ΔH = –57.0 kJ/mol N2(g) + O2(g) 2NO(g) ΔH = 180.6 kJ/mol 2NO2(g) 2NO(g) + O2(g) ΔH = ...
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im not fully understanding of hess law but i got -1411 kj/mol for an answer
Answer:
That looks the right sort of order, and you've definitely got the sign correct, but without the figures...
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Calculate the enthalpy of the reaction: 2NO(g) + O2(g) --> 2NO2(g) given the following reactions and enthalpies of formation: 1/2 N2(g) + O2(g) --> NO2(g), delta H *A = 33.2 kJ 1/2 N2(g) + 1/2O2(g) --> NO(g), delta H *B= 90.2 kJ Calculate the...
Answer:
The Hess law is used to discover the reaction's entalphy and doing it, you must cancel the same substances...
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Usually I'm great with problem solving, math, chem, ect., but I can't figure it out for the life of me: Calculate the reaction enthalpy for the following reaction: 5CO2 + Si3N4 --> 3SiO + 2N20 + 5CO It gives me the following enthalpies and tells me...
Answer:
1) multiply first reaction by 3 2) do nothing to second reaction The result: 3CO + 3SiO2 --> 3SiO...
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I have a few problems I really need help on the first is: A) Use the (Delta)H^degree) data given to calculate (Delta)H^degree sign) for the reaction: C2H4(g) + H2(g) -> C2H4 Data: C2h4(g) + 3.5O2 -> 2CO2(g) + 3H2O(l) DeltaH^degree (KJ) -1560 C...
Answer:
1) first equation - flip it 2) second equation - leave untouched 3) third equation - divide by 2 Your...
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(a) Use bond enthalpies to estimate the enthalpy change for the reaction of hydrogen with ethylene. H2(g) + C2H4(g) → C2H6(g) kJ (b) Calculate the standard enthalpy change for this reaction, using heats of formation. kJ Why does this value differ...
Answer:
Some discussion and examples: http://www.chemteam.info/Thermochem/Hess… reactants ---> one...
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