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How much heat is produced when 100 mL of 0.250 M HCl (density, 1.00 g/mL) and 200 mL of 0.150 M NaOH (density, 1.00 g/mL) are mixed?
HCl ( a q ) + NaOH ( a q ) NaCl ( a q ) + H 2 O ( l ) Δ H 298 ° = −58 kJ

If both solutions are at the same temperature and the heat capacity of the products is 4.19 J/g °C, how much will the temperature increase? What assumption did you make in your calculation?

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A sample of 0.562 g of carbon is burned in oxygen in a bomb calorimeter, producing carbon dioxide. Assume both the reactants and products are under standard state conditions, and that the heat released is directly proportional to the enthalpy of combustion of graphite. The temperature of the calorimeter increases from 26.74 °C to 27.93 °C. What is the heat capacity of the calorimeter and its contents?

15.5 kJ/ºC

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Before the introduction of chlorofluorocarbons, sulfur dioxide (enthalpy of vaporization, 6.00 kcal/mol) was used in household refrigerators. What mass of SO 2 must be evaporated to remove as much heat as evaporation of 1.00 kg of CCl 2 F 2 (enthalpy of vaporization is 17.4 kJ/mol)?

The vaporization reactions for SO 2 and CCl 2 F 2 are SO 2 ( l ) SO 2 ( g ) and CCl 2 F ( l ) CCl 2 F 2 ( g ) , respectively.

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Homes may be heated by pumping hot water through radiators. What mass of water will provide the same amount of heat when cooled from 95.0 to 35.0 °C, as the heat provided when 100 g of steam is cooled from 110 °C to 100 °C.

7.43 g

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Which of the enthalpies of combustion in [link] the table are also standard enthalpies of formation?

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Does the standard enthalpy of formation of H 2 O( g ) differ from Δ H ° for the reaction 2H 2 ( g ) + O 2 ( g ) 2 H 2 O ( g ) ?

No.

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Joseph Priestly prepared oxygen in 1774 by heating red mercury(II) oxide with sunlight focused through a lens. How much heat is required to decompose exactly 1 mole of red HgO( s ) to Hg( l ) and O 2 ( g ) under standard conditions?

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How many kilojoules of heat will be released when exactly 1 mole of manganese, Mn, is burned to form Mn 3 O 4 ( s ) at standard state conditions?

459.6 kJ

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How many kilojoules of heat will be released when exactly 1 mole of iron, Fe, is burned to form Fe 2 O 3 ( s ) at standard state conditions?

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The following sequence of reactions occurs in the commercial production of aqueous nitric acid:
4 NH 3 ( g ) + 5 O 2 ( g ) 4 NO ( g ) + 6 H 2 O ( l ) Δ H = −907 kJ
2 NO ( g ) + O 2 ( g ) 2 NO 2 ( g ) Δ H = −113 kJ
3 NO 2 + H 2 O ( l ) 2 HNO 3 ( a q ) + NO ( g ) Δ H = −139 kJ

Determine the total energy change for the production of one mole of aqueous nitric acid by this process.

−495 kJ/mol

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Both graphite and diamond burn.
C ( s , diamond ) + O 2 ( g ) CO 2 ( g )

For the conversion of graphite to diamond:
C ( s , graphite ) C ( s , diamond ) Δ H 298 ° = 1.90 kJ

Which produces more heat, the combustion of graphite or the combustion of diamond?

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From the molar heats of formation in Appendix G , determine how much heat is required to evaporate one mole of water: H 2 O ( l ) H 2 O ( g )

44.01 kJ/mol

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Which produces more heat?
Os ( s ) 2 O 2 ( g ) OsO 4 ( s )
or
Os ( s ) 2 O 2 ( g ) OsO 4 ( g )

for the phase change OsO 4 ( s ) OsO 4 ( g ) Δ H = 56.4 kJ

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Calculate Δ H 298 ° for the process
Sb ( s ) + 5 2 Cl 2 ( g ) SbCl 5 ( g )

from the following information:
Sb ( s ) + 3 2 Cl 2 ( g ) SbCl 3 ( g ) Δ H 298 ° = −314 kJ SbCl 3 ( s ) + Cl 2 ( g ) SbCl 5 ( g ) Δ H 298 ° = −80 kJ

−394 kJ

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Questions & Answers

what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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The eyes of some reptiles are sensitive to 850 nm light. If the minimum energy to trigger the receptor at this wavelength is 3.15 x 10-14 J, what is the minimum number of 850 nm photons that must hit the receptor in order for it to be triggered?
razzyd Reply
A teaspoon of the carbohydrate sucrose contains 16 calories, what is the mass of one teaspoo of sucrose if the average number of calories for carbohydrate is 4.1 calories/g?
ifunanya Reply
4. On the basis of dipole moments and/or hydrogen bonding, explain in a qualitative way the differences in the boiling points of acetone (56.2 °C) and 1-propanol (97.4 °C), which have similar molar masses
Kyndall Reply
Calculate the bond order for an ion with this configuration: (?2s)2(??2s)2(?2px)2(?2py,?2pz)4(??2py,??2pz)3
Gabe Reply
Which of the following will increase the percent of HF that is converted to the fluoride ion in water? (a) addition of NaOH (b) addition of HCl (c) addition of NaF
Tarun Reply

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Source:  OpenStax, Ut austin - principles of chemistry. OpenStax CNX. Mar 31, 2016 Download for free at http://legacy.cnx.org/content/col11830/1.13
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