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

Actinide, what are ionization energy of actinides?

what are ionization energy of actinides?

Extraction of copper metal, what is the name given to the impure copper obt...

what is the name given to the impure copper obtained through this process

S block element, What is differences by alkali metal and alkaine earth meta...

What is differences by alkali metal and alkaine earth metal which provided colour

Calculate the requirement of nitric and sulphuric acid, Blending is an impo...

Blending is an important unit operation in the chemical and process industries. It is employed in a wide variety of industries including the production of cement and gasoline. C

#title.organic, how can be synthesise active methylene group contining comp...

how can be synthesise active methylene group contining compound

Physical properties of nitro alkanes or nitroparaffins, Physical properties...

Physical properties of Nitro alkanes or Nitroparaffins (1) Nitro alkanes are colourless, pleasant smelling liquids. (2) These are sparingly soluble in water but enthusiastic

Salt analysis, what is the colour of the residue for nickel in charcoal cav...

what is the colour of the residue for nickel in charcoal cavity test

Co-ordination compound, The hybradization state of the Fe among [Fe(CN)6]3-...

The hybradization state of the Fe among [Fe(CN)6]3-,[Fe(CO)5] and [Fe(H2O)6]2+ is   Ans) D2SP3,DSP3,SP3D2

Carbonyl compounds, which compound has sharp, unpleasant and pungent smell?...

which compound has sharp, unpleasant and pungent smell?

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