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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 ) ?


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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 )
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

Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
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what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
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what is nano technology
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what is system testing?
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?
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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
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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
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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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