Chemistry

1.Calculate the

Chemistry

1.Calculate the standard enthalpy change for the given reaction.

PbS(s) + 4H2O2(aq) PbSO4(s) + 4H2O(l)

(Obtain ?Hof (kJ/mol) values for the substances from the textbook — Pg. 250 and Appendix C, A-8 ) (4 points)

2.The sugar, Glucose, C6H12O6, is burned completely in oxygen in a calorimeter.

C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(l)

Burning a 0.560 g sample of glucose caused the temperature to rise from 22.00° C to 22.64° C. The heat capacity of the calorimeter and its contents is 15.8kJ/°C. Calculate ?H for the combustion reaction per mole of Glucose.

(4 points

3.Calculate the energy of the emitted photon as well as the wavelength and frequency of electromagnetic radiation emitted from the hydrogen atom when the electron undergoes the transition from n = 5 to n = 1. In what region of the spectrum does this line occur? (4 points)

 

a. State which of the following sets of quantum numbers would be permissible and which would be impossible for an electron in an atom. If not permissible, then explain your answer. (2 points)

1. n = 1, l = 1, ml = 0, ms = +1/2

n = 2, l = 1, ml = -1, ms = +1/2

4.Ethanol, C2H5OH, is mixed with gasoline and sold as gasohol. Use the following to calculate the grams of ethanol needed to provide 388 kJ of heat.

C2H5OH(l) + 3O2(g) 2CO2(g) + 3H2O(g) ; H = -1235 kJ. (2 points)

5.What is the de Broglie wavelength of an oxygen molecule,

 

 

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for the given reaction.

PbS(s) + 4H2O2(aq) PbSO4(s) + 4H2O(l)

(Obtain ?Hof (kJ/mol) values for the substances from the textbook — Pg. 250 and Appendix C, A-8 ) (4 points)

2.The sugar, Glucose, C6H12O6, is burned completely in oxygen in a calorimeter.

C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(l)

Burning a 0.560 g sample of glucose caused the temperature to rise from 22.00° C to 22.64° C. The heat capacity of the calorimeter and its contents is 15.8kJ/°C. Calculate ?H for the combustion reaction per mole of Glucose.

(4 points

3.Calculate the energy of the emitted photon as well as the wavelength and frequency of electromagnetic radiation emitted from the hydrogen atom when the electron undergoes the transition from n = 5 to n = 1. In what region of the spectrum does this line occur? (4 points)

 

a. State which of the following sets of quantum numbers would be permissible and which would be impossible for an electron in an atom. If not permissible, then explain your answer. (2 points)

1. n = 1, l = 1, ml = 0, ms = +1/2

n = 2, l = 1, ml = -1, ms = +1/2

4.Ethanol, C2H5OH, is mixed with gasoline and sold as gasohol. Use the following to calculate the grams of ethanol needed to provide 388 kJ of heat.

C2H5OH(l) + 3O2(g) 2CO2(g) + 3H2O(g) ; H = -1235 kJ. (2 points)

5.What is the de Broglie wavelength of an oxygen molecule,

 

 

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