Quiz 1211 Name
Show all work and show units in calculations!
c = 3.0×1 Ot m/s h = 6.626×10-34 .1, 1 cal = 4.184 J
1. Use the heat equation to calculate the number of joules of heat that will be gained or lost (specify which) when a copper penny (mass = 3.11 g) is removed from your pocket where it was at equilibrium with your body temperature of 37.1 °C and is placed on a nightstand and allowed to come to room temperature of 23.4 °C. Assume that the penney is pure copper. The specific heat of copper is 0386 J/g°C. Specify the answer in J and in calories.
2. Calculate the standard enthalpy of reaction when nitrogen dioxide gas reacts with liquid water to form aqueous nitric acid and nitrogen monoxide gas. A table of
standard enthalpies of formation that includes the relevant
Formula State AH?
(kJ/mot) substances appears below.
N2 g 0 a) Balanced chemical equation:
NH3 g —45.94
NH: aq —133.26
NO3″ aq —104.6
NO2″ aq —206.85
N21-14 1 +50.6 b) Show work in calculating enthalpy of reaction:
NH4C1 s —314A
NH4NO3 s —365.6
NO g +90.2
NO2 g +33.2
N204 g +9.2
Na s 0
Nu+ aq —240.34
NaCI s —411.2
NaF s —573.6
NaOH s +425.6
HCI g —9231
HNO3 aq —206.6
1120 I —285.83
1-120 g —241.82
3_ a) Calculate the wavelength of a photon of red light whose frequency is 4.58×10’4
Show work and all units in the calculation:
b) Calculate the frequency of a photon of EM radiation whose wavelength is 1.00 m. Show work and all units in the calculation:
4. a) Calculate the energy of a photon of radio wave whose wavelength is 7.5 m.
Show work and all units in the calculation:
b) Calculate the energy of a photon of X-ray whose wavelength is 7.5 ran. Show work and all units in the calculation:
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