Thermodynamics / Quantum Mechanics, Chemistry

Assignment Help:
1. A laboratory animal exercised on a treadmill that was connected to a weight with a mass of
250. g through a pulley. The work done by the animal raised the weight through 1.32 m. At the
same time the animal gave off 8.0 J of energy as heat. Disregarding any other losses and treating
the animal as a closed system, what was the change in internal energy of the animal?

2. A piece of metal of mass 20.0 g at 100.0 oC is placed in a calorimeter containing 50.7 g at water
at 22.0 oC. The final temperature of the mixture is 25.7 oC. What is the specific heat capacity of
the metal?

3. Suppose that coal of density 1.5 g.cm-3 is carbon. The combustion of carbon is described by the
equation
C(s) + O2(g) ---> CO2(g) ?Ho = -394 kJ
(a) Calculate the heat produced when a lump of coal of size 7.0 cm x 6.0 cm x 5.0 cm is burned.
(b) Estimate the mass of water that can be heated from 25 oC to 100.oC by burning this piece of
coal.

4. Calculate the standard enthalpy of formation for dinitrogen pentoxide from the following data
and from the standard enthalpy of formation of nitric oxide.

2NO(g) + O2(g) ---> 2NO2(g) ?Ho = -114.1 kJ

4NO2(g) + O2(g) ---> 2N2O5(g) ?Ho = -110.2 kJ

5. The average speed of a helium atom at 25oC is 1.23 x 103 m.s-1. What is the average wavelength
of a helium atom at this temperature?

6. Complete the following questions for the hydrogen atom:

(a) What is the highest energy photon that can be absorbed by a ground-state hydrogen atom
without causing ionization?
(b) What is the wavelength of this radiation?
(c) To what region of the electromagnetic spectrum does this photon belong?

Related Discussions:- Thermodynamics / Quantum Mechanics

HYDROGEN, #questionWHY LANE''S PROCESS IS ALSO KNOWN AS VIVIFICATION PROCES...

#questionWHY LANE''S PROCESS IS ALSO KNOWN AS VIVIFICATION PROCESS?..

Volumetric analysis-stoichiometry, to determine the exact concentration of ...

to determine the exact concentration of a monobasic acid, hx

Structure of 2-ethylbutanoic acid, 2-Ethylbutanoic acid can be prepared by ...

2-Ethylbutanoic acid can be prepared by a malonic ester synthesis

Quantum numbers for an electron of an atom is not possible, Which set of qu...

Which set of quantum numbers for an electron of an atom is not possible: (1) n=1 l=0, m=-0, s= +1/2   (2) n=1, l=1, m=-1, s= +1/2  (3)  n=1, l=0, m=0, s= -1/2   (4) n=

Exothermic and endothermic reaction, describe exothermic and endothermic re...

describe exothermic and endothermic reactions with examples.

Addition of grignard reagents and water, Addition of Grignard reagents: ...

Addition of Grignard reagents: Grignard reagents react along with carbonyl compounds to offer alcohols. Nature of alcohol lies on the nature of carbonyl compound. Addition o

Ionic character , Compute the percent ionic character of the interatomic bo...

Compute the percent ionic character of the interatomic bonds for the following compound: TiO2.

Explain resonance effects, Explain Resonance effects Resonance effects:...

Explain Resonance effects Resonance effects:  The application of the resonance effect for predicting the relative rates of acid-catalyzed ester and amide hydrolyses is exactly

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd