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

Metallugy, general principal for extraction of metals

general principal for extraction of metals

How can we obtain boron, Q. How can we obtain Boron? Boron is- obtained...

Q. How can we obtain Boron? Boron is- obtained by the red-action of B 2 O 3 with magnesium or sodium B 2 0 3 is first prepared by strongly katingH 3 B0 3 which is obtained b

Liquid propellants - monopropellants and bipropellants, Liquid propellants ...

Liquid propellants - Monopropellants and Bipropellants These contain an oxidizer like liquid oxygen, nitrogen tetroxide (N 2 O 2 ) or nitric acid and a fuel for example alcohol

Electricity need to produce one mole of copper from sulphate, The amount of...

The amount of electricity required to produce one mole of copper from sulphate solution will be how many faradays? Ans)   2 faraday of electricity is required to produce one mol

Ionisation enthalphy, what is the relevance of half filled and completely f...

what is the relevance of half filled and completely filled orbitals in ionisation enthalphy ditermination

Define the hydration rate, The hydration rate of the deuterium-substituted ...

The hydration rate of the deuterium-substituted styrene should vary very little, if at all, from that of styrene itself, because the deuteriums are not transferred in the rate-limi

Chem project, need to know common methods of preparing acetone/propanone. N...

need to know common methods of preparing acetone/propanone. Need to include chemical equation for reaction that produces that molecule.

Making a model hydraulic elevator, Making a model hydraulic elevator So...

Making a model hydraulic elevator Some freight and passenger elevators are increased by water pressure. You can make a model of one of these with an automobile hand pump. Conne

Concepts of valence bond theory, Q. Concepts of valence bond theory? Th...

Q. Concepts of valence bond theory? The developments can also be cited as a typical example of the manner in which scientific theories grow and are refined in any particular fi

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