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

Acidity determination, 20ml of water sample requires 15ml of 0.1mg/l sodium...

20ml of water sample requires 15ml of 0.1mg/l sodium carbonate using phenolphthalein indicator. state the type of acidity and calculate the acidity

Write the neutral calcium atom has a number, Write the neutral calcium atom...

Write the neutral calcium atom has a number The neutral calcium atom has a number of valence electrons euivalent to its group number, that is 2.

Stoichiometry, if 45.0 L of natural gas, which is essentially methane, unde...

if 45.0 L of natural gas, which is essentially methane, undergoes complete combustion at 730 mm Hg and 20 degrees Celsius, how many grams of each product are formed?

The number of electrons in, The number of electrons in [ 40 19 k ] -1   i...

The number of electrons in [ 40 19 k ] -1   is: (1) 19      (2) 20      (3)18     (4)40 Ans: 40

Define heat of combustion, The amount of heat liberated when single mole of...

The amount of heat liberated when single mole of any substance is completely burnt in oxygen is known as heat of combustion H is negative for heat of combustion.

Formation of esters or esterification , Formation of esters (Esterific...

Formation of esters (Esterification)              (1) The reaction is shifted to the right via using excess of alcohol or removal of water by distillation. (2) The re

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