A ) Calculate the enthalpy change, H , for the processin which 37 9 g...

A.) Calculate the enthalpy change, Î”H, for the process in which 37.9 g of water is...

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Chemistry

A.) Calculate the enthalpy change, Î”H, for the processin which 37.9 g of water is converted from liquid at 4.6 âˆ˜C tovapor at 25.0 âˆ˜C .
For water, Î”Hvap = 44.0 kJ/mol at 25.0 âˆ˜C andCs = 4.18 J/(gâ‹…âˆ˜C) for H2O(l).
B.)How many grams of ice at -29.4 âˆ˜C can be completely convertedto liquid at 20.7 âˆ˜C if the available heat for this process is5.90Ã—10³ kJ ?
For ice, use a specific heat of 2.01 J/(gâ‹…âˆ˜C) andÎ”Hfus=6.01kJ/mol.
C.)In the following experiment, a coffee-cup calorimetercontaining 100 mL of H2O is used. The initial temperature of thecalorimeter is 23.0 âˆ˜C. If 4.20 g of CaCl2 is added to thecalorimeter, what will be the final temperature of the solution inthe calorimeter? The heat of solution Î”Hsoln of CaCl2 isâˆ’82.8 kJ/mol.
D.)
Calculate the standard enthalpy change for the reaction
2A+Bâ‡Œ2C+2D
Use the following data:
Substance Î”Hâˆ˜f
(kJ/mol)
A -255
B -413
C 223
D -485
Express your answer to three significant figures and include theappropriate units.

Answer & Explanation Solved by verified expert

4.4 Ratings (851 Votes)

d 2A B 2C 2D delta Hrkn 2delta Hf D delta Hf C 2delta Hf A delta Hf B 399 JK c Heat evolved mass of solutionspecific heat capacity of the solutionchange in temperature or 82800 See Answer

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