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

Hybridisation, how does the concept hybridization applies in pharmacy field...

how does the concept hybridization applies in pharmacy field ?

S block elements, lithium and beryllium markedly differ from other members ...

lithium and beryllium markedly differ from other members of their respstive groups

Basic concepts, what are ion? under what conditions are they produced?

what are ion? under what conditions are they produced?

Solvent effect of UV, what is the solvent effect on transition metal?

what is the solvent effect on transition metal?

Ketone bodies conversion, I wish to convert beta hydroxy butyrate to either...

I wish to convert beta hydroxy butyrate to either acetoacetate/ acetone or any other forms to be detected using some dyes. Kindly help me.

Direction of the shift of electron pair, Direction of the shift of electron...

Direction of the shift of electron pair The direction of the shift of electron pair can be decided on the basis of subsequent points. (i) While the sets related to a multipl

Two chair conformations of cis-1-3-dimethylcyclohexane, The two chair confo...

The two chair conformations of cis-1,3-dimethylcyclohexane

Structure of covalent bonds, Q. Structure of Covalent Bonds? Ans. ...

Q. Structure of Covalent Bonds? Ans. A covalent bond forms between elements that are near each other in the periodic table While an ionic bond involves an exchange of e

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