Thursday
April 17, 2014

# Search: delta G naught

Number of results: 3,720

chemistry
C2H5OH + 3O2 --> 2CO2 + 3H2O How many grams of O2 are consumed when 5.86 ml of Ethanol burns completely (the density of C2H5OH is 0.789 g/ml)?
Thursday, February 16, 2012 at 8:19pm by Delta

Chemistry
CH4 + 2O2 ==> CO2 + 2H2O You must have been given a delta H value. dH value x (2.27/molar mass CH4) = ?
Wednesday, March 7, 2012 at 9:21pm by DrBob222

College Physics
The kinetic energy decrease (240 J) equals her potential energy increase: (M*g*deltaY) Delta Y is her increase in elevation during that time, which is 240J/(M*g) = 0.583 m
Friday, March 16, 2012 at 11:26pm by drwls

I did -431.16kJ/mol X 1000 = -431160 Then -431160 - (298 X 0.12529 kJ/K*mol) = -431197.33 for delta G but this answer was said to be incorrect, I do not know why??
Wednesday, April 25, 2012 at 6:47pm by Hannah

chemistry
delta t = i*Kf*m m = mols/kg solvent 4= (3)(1.86) m= 0.717 (0.717)(1000) = 0.000717mol 0.000717mol/110.98g/mol = 6.46 x 10^-6g
Saturday, March 2, 2013 at 5:40pm by Dee

Elements of Structures MIT 2.02
Do you get 8050π for the EI of the composite beam? I get 8050π For some reason, I get δ=-0.1164, which is exactly double your number.
Saturday, July 27, 2013 at 2:32pm by MathMate

scuence
if known h2 + br2 produce delta h 2hbr totaled 11.2 -72 then to decipher hbr gas into H2 and br2 as much heat is required?
Monday, November 18, 2013 at 6:52am by febhie

Chemistry
C3H8 + 5O2 ==> 3CO2 + 4H2O dHrxn = (n*Hfproducts)-(n*Hf reactants) Look up the delta Hf values, substitut and solvef or dHrxn.
Monday, March 3, 2014 at 4:38pm by DrBob222

chemistry
q = mass x specific heat x delta T. Solve for specific heat.
Thursday, September 22, 2011 at 2:38pm by DrBob222

Chemistry
I think you're on the wrong track and you have added what you started with to what I gave you earlier and now you have them mixed up, I think. See if this makes sense? delta P = Xsolute*Posolvent delta P = 100-60 = 40 40 = Xsolute*100 Xsolute = 40/100 = 0.40 So Xbenzene = 1.00...
Monday, February 15, 2010 at 7:48pm by DrBob222

Chemestry I
I answered this question yesterday for someone but I can't find the answer to copy it. Here is what you do; however, let me point out that I think you have a typo in the problem. I'm sure the freezing point is -0.102 and not +0.102. There are two problems here. A. Problem #1. ...
Sunday, October 26, 2008 at 7:19pm by DrBob222

Atmospheric Science
Use the mixing ratio to calculate the density of the air. In this case, it means that it is 1% water vapor. The mean molecular weight of the air will be about 28.9 g/mole. Then use the fact that pressure decreases with altitude according to delta P = -Integral of (density) g ...
Wednesday, November 11, 2009 at 10:28pm by drwls

Gen chem 2
w = p*delta w = 3.9*(11.75-0.806) = ? in L*atm. If you want the work in J, multiply by 101.325. Since the volume is decreasing it means the surrounds are doing work on the system (the balloon) so the sign of work is +. v
Wednesday, November 6, 2013 at 7:43pm by DrBob222

chemistry
When 0.752 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 12.2C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do not ...
Friday, February 9, 2007 at 11:52pm by nickel

CHEM HELP!!
I get 233 also if I plug in the numbers. What you have done is to solve for T for the conditions listed. What yo want to do is to set delta G = 0 (which is equilibrium point and anything negative is spontaneous). 0 = 25-T(0.015). T = 1666 K which I would round to 1670 K. ...
Tuesday, August 11, 2009 at 6:08pm by DrBob222

Biochemistry
ATP hydrolysis at pH 7.0 is accompanied by release of a hydrogen ion to the medium. if delta G note for this reactionis -30.5 kJ/mol, what is the free energy change for the same reaction with all component, including H+ at a standard state
Wednesday, October 6, 2010 at 12:31pm by Help Pleasssssssse!!!

chemistry
Mass H2O x specific heat x delta T = q = heat evolved when 0.638 g Ca is reacted with HCl. So q/0.638 will give you J/g Convert that to J/mol. Post your work if you get stuck.
Wednesday, February 18, 2009 at 7:55pm by DrBob222

physics
100 - 80= 20 J. Any work done on the gas that does not escape as heat becomes internal energy. Qin = Wout + delta U In this case both Wout and Qin are negative
Tuesday, December 29, 2009 at 7:42pm by drwls

Chemistry
So far i have deltaH= 20g x 4.18 j/g deg C x 80 deg = 6.688KJ AND DELTA H= 1.11mol x 40.8 KJ/Mol = 45.3 kj but i dont know what to do next :(
Tuesday, April 27, 2010 at 4:19pm by lala

chemistry
90 WHAT? grams, kg, moles. Also, what do you have for the heat of combustion per mole (delta H for the reaction). If you will post that and your work I'm sure we can help with the answer. If you know the answer, post that too.
Friday, May 14, 2010 at 12:32pm by DrBob222

chemistry
The triangle is a capital Greek letter delta. The equation you have is the correct one to use. What is the problem? You simply use direct substitution of the numbers into the equation.
Wednesday, September 15, 2010 at 4:49pm by DrBob222

Thermochemistry Ap Chem homework
(10.0 g water) (delta 20 degrees C)(4.184J/g x C) = 836.8 J needed to heat the water. You just forgot to multiply the specific heat.
Monday, November 15, 2010 at 5:58pm by John

chemistry
Just substitute into the equation you are given with the data you are given and turn the crank---out comes the answer. I would have written the equation as q = mc*delta T.
Tuesday, October 9, 2012 at 11:54am by DrBob222

Chemistry
I have looked all over the net and I can't find the value for delta H for H^+ + OH^- ==> H2O but I know it is exothermic. All neutralization reactions are exothermic; some more than others.
Sunday, February 10, 2013 at 11:56pm by DrBob222

chemistry
For a certain change, value of Delta U is -2.37 kJ. During the change, the system absorbs 650 joules. How much work did the system do? Please help! I get 3.02 but is not correct!!
Friday, March 1, 2013 at 12:45pm by Mary

Chemistry- HWK CHECK
1. A solution in which no more solid can be dissoved is referred to as ____. Answer: saturated 2.At constant pressure, heat can be referred to as (entropy, enthalpy, or free energy). Answer: enthalpy The measure of disorder or randomness of a system is(entropy, enthalpy, or ...
Monday, August 4, 2008 at 9:10pm by Blair

college chemistry-thermochemistry
subl = energy to sublime K solid. IP = energy to ionize K(g). BDE = bond dissociation energy to dissociate Br2 liquid to Br2 gas. Take 1/2 of the value unless that has been done already. Also, note that this should include the vaporization, also. If you have been given that ...
Saturday, November 8, 2008 at 8:49pm by DrBob222

AP Chemistry
Use the Clausius-Clapeyron equation. 760 torr is the pressure at the normal boiling point of 56.5. Don't forget that T1 and T2 must be in Kelvin, delta H vap must be in J and R = 8.314 J/mol*K.
Wednesday, January 2, 2008 at 8:03pm by DrBob222

physics
Have you ever seen this formula? Heat input = M C *(delta T) which means: =(mass)(specific heat)(temperature rise) Plug in the numbers and crank away. Your answer will be in calories if you use the units above.
Sunday, December 13, 2009 at 11:07pm by drwls

Chemistry
Nacl(s)+ HCl---->H20 +NaCl(aq) delta H(amouint of energy aborbed by the solution is 4263.6J) Is it okay to say that H2 represents the heat evolved to neutralize 2g of NaOH with an acid
Thursday, May 6, 2010 at 5:39pm by Ade

Chemistry 2
C8H8 + 10 O2 ==> 8CO2 + 4H2O 42.62 kJ/gram. Convert to kJ/mole which will be delta Hrxn. Then DHrxn = (n*DHproducts)-(DHreactants) and solve for DH styrene/mol.
Sunday, February 6, 2011 at 2:39pm by DrBob222

chemistry
a 55g aluminum block initially at 27degrees C absorbs 725J of heat. What is the final temp. I know I need to use the equation q=m*Cs*Delta T but I cannot figure out how to rearrange the equation to isolate Tf to get the answer. Thanks for any help.
Sunday, November 4, 2012 at 5:29pm by Dee

AP Chemistry
This temperature represents the freezing point of ethanol. (Which means delta G = 0) What is the entropy change for the vaporization of 3.3 mol H2O(ℓ) at 100◦C and 1 atm? ∆H= 40700 J/mol. Answer in units of J/K
Tuesday, October 29, 2013 at 6:41pm by Gabriella

Science
1. To a scientist, a river is a kind of stream. True or False. 2. All streams carry sediment. T/F. 3. A delta keeps growing. T/F. 4. Heavy rain always cause flooding. T/F. 5. A river bank is at the end of a river. T/F.
Monday, March 25, 2013 at 6:52pm by T-perry

geography
distributaries? North of Cairo, the Nile splits into two branches (or distributaries) that feed the Mediterranean: the Rosetta Branch to the west and the Damietta to the east, forming the Nile Delta.
Monday, February 22, 2010 at 7:36pm by PsyDAG

chemistry
Delta Srxn = sum So products - sum So reactants. But the tables in my text (a freshman text) don't have S listed. If your does, it just a simple matter of substituting the numbers and running the above.
Wednesday, March 3, 2010 at 11:39pm by DrBob222

chemistry
delta T = Kf*m Convert -30F to degrees C. Substitute into the formula and solve for m. Since molality = moles/kg solvent that will be moles/L IF we assume 1 L of water has a mass of 1 kg.
Tuesday, December 14, 2010 at 4:28pm by DrBob222

History
During the Song Dynasty, Jurchen invaders from the North forced the Song to withdraw past the a.Gobi Desert b.Himalayas c.Yellow River d.Yangtze River e.Mekong Delta
Wednesday, October 10, 2012 at 6:12pm by Billy

Chemistry
mols C12H22O11 = grams/molar mass Then m = mols/kg solvent Then delta T = Kf*m. You know m and Kf, solve for dT, then subtract from 0C to find the new freezing point.
Wednesday, September 11, 2013 at 9:00pm by DrBob222

Chem help!!
A rock salt (NaCl), ice, and water mixutre is used to make homemade ice cream. How many grams of rock salt must be added to lower the freezing point 10.0 degrees C? I have no idea what to do, please help! delta T = Kf*i*m delta T = 10. Kf is the molal freezing point constant, ...
Thursday, May 3, 2007 at 7:24pm by Lindsay

Chemistry
I wonder if that is kJ/month or kJ/mol. I assume kJ/mol. No, the equation isn't q = CmT. It's mass x delta Hvap.
Tuesday, May 18, 2010 at 11:04pm by DrBob222

Chemistry
You can use delta T = i*kb*m for each of these. For example, for A. i = 2 Kb = 0.51 m = 0.1 all for KI. for ethanol, i = 1 Kb = 0.51 m = 0.1 therefore, A is false.
Wednesday, September 8, 2010 at 3:02pm by DrBob222

chemstry
q = mass H2O x specific heat H2O x (Tfinal-Tinitial) q/mol = delta H for 2 mols H2O. Divide by 2 for J/mol.
Thursday, June 21, 2012 at 5:40pm by DrBob222

Calculus
Surely by now you know that ∆ is pronounced "delta". At x=2, ∆y = f(x+∆x)-f(x) = (2-2.01^4)-(0) = 0.3224 dy = -4x^3 dx = -4(8)(-.01) = 0.32
Monday, December 16, 2013 at 6:03pm by Steve

Honors Chemistry
A negative energy is defined to mean that the reaction is exothermic; i.e., the reaction gives off energy. Delta H is positive for an endothermic reaction.
Tuesday, October 27, 2009 at 5:25pm by DrBob222

AP Chem
delta Hrxn = (sum bonds broken reactants) - (sum bonds formed products). Solve for NBr bonds and divide by 3.
Sunday, November 7, 2010 at 4:31pm by DrBob222

Chemistry
heat generated by camphor is 5903.6 kJ/mol x 0.124/152.24 = ? kJ ?kJ = Ccal x delta T. Solve for Ccal.
Sunday, September 16, 2012 at 8:41pm by DrBob222

Chemistry
The boiling point of an aqueous solution is 102.48 °C. What is the freezing point? I know that formula for freezing point is delta Tf = Kf*m but what do I plug in for each?
Tuesday, January 29, 2013 at 9:22pm by Anon

Calculus
limit as x->2- = 5 limit as x->2+ = 5 since one-sided limits are the same, and f(2)=5, f is continuous Do you have to do the delta-epsilon limit proof?
Wednesday, March 12, 2014 at 2:15am by Steve

physics
v down = sqrt (2 g h) = sqrt (2*9.8*5) = 9.9 m/s v up = sqrt (2 * 9.8*2) = 6.26 change in momentu = m delta v = 1(9.9+6.26) = 16.2 kg m/s
Thursday, January 26, 2012 at 9:54pm by Damon

Chemistry
work = p*delta V. That gives units of L*atm. Convert L*atm to joules. 1 L*atm = 101.25 joules.
Friday, July 12, 2013 at 1:13am by DrBob222

Chemisrty
heat required is q. q = mass water x specific heat water x delta T. Now all you need is the heat released when a mole of CaCl2 dissolves.
Tuesday, February 23, 2010 at 1:33am by DrBob222

Chemistry Help!!
I made a typo trying to type the sub subscripts and superscripts. .....should be listed in your text as delta Hof then follow......
Tuesday, October 11, 2011 at 2:34pm by DrBob222

physics
Heat energy required = Q = (Mass)*(Specific Heat)*(Temperature rise) It is often written M*C*(delta T) For platinum, the answer is 5*25*133 = 17,000 J (rounded to two significant figures) Now do water.
Saturday, January 8, 2011 at 11:59am by drwls

statistics
Only the formula to do this exercise, Thank you. In a study by Web Criteria, it took an average of 2.1 minutes to locate information and buy products on the Delta Airlines website, compared to an average of 2.7 minutes on the British Airways site. Assume that data file ...
Sunday, August 9, 2009 at 5:47pm by Maggy

chemistry
(products)- (reactants)=delta H (-403.4 kJ/mol)-(-425.3 kJ/mol)=21.9 kJ
Sunday, September 4, 2011 at 9:34pm by Hightower

Law
Here is a good place to begin: http://www.google.com/search?q=justice+mamman+Nasir+boundary+commission+report+on+ondo+state+and+Delta+state+of+Nigeria+boundary+dispute&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a Sra
Saturday, September 12, 2009 at 2:17pm by SraJMcGin

Science 9
2.0kg block of iron transfers 180,000j to the atmosphere around it. If its initial temperature was 350 celius what is it's final temperature? If you know the specific heat of iron, you can use Q = mc(delta T).
Saturday, December 30, 2006 at 2:45pm by Ruby

Chemistry
How much heat is released when a mixture containing 10.0g CS2 and 10.0 g Cl2 reacts by the equation. CS2 + 3Cl2 ----> S2Cl2 + CCl4 Delta H = -230 kJ
Thursday, November 1, 2007 at 5:40pm by Lauren

Chem
How much heat is released when a mixture containing 10.0g CS2 and 10.0 g Cl2 reacts by the equation. CS2 + 3Cl2 ----> S2Cl2 + CCl4 Delta H = -230 kJ
Thursday, November 1, 2007 at 9:18pm by Lauren

Chemistry
Pure substances have heat formation (delta Hf) of zero. -24.8 kJ x (2.90g Fe2O3/molar mass Fe2O3) = -?? The minus sign means heat is evolved.
Wednesday, April 6, 2011 at 6:00pm by DrBob222

Chemistry
It is best to post questions separately. Better chance of getting both of them worked. m = moles/kg solvent solve for m since you have moles and g solvent. Then delta T = i*Kf*m i for NaCl = 2.
Wednesday, April 27, 2011 at 11:55pm by DrBob222

Chemistry
Consider the reaction 3CH_4(g)rightarrow C_3H_8(g)+ 2H_2(g). Calculate delta G at 298 K if the reaction mixture consists of 40atm of CH_4, 0.015atm of C_3H_8, and 2.3×10^−2atm of H_2.
Thursday, December 6, 2012 at 11:31am by Josh G.

Chem II
delta T = i*Kb*m if m is constant and Kb is constant, then the only variable is i and you can ignore Kb and m. So look at i; the one with the largest i will have the highest boiling point.
Friday, June 6, 2008 at 1:51pm by DrBob222

physics
The added load is F = M g = 24.5 N The spring will stretch by an amount delta L = F/k = 0.46 m (46 cm) That will increase the length to the 46 + 15 = 61 cm mark.
Thursday, August 19, 2010 at 5:39am by drwls

Chemistry
You can calculate the heat of combustion from delta Hformation. C2H6 + 7/2 O2 ==> 2CO2 + 3H2O dHrxn = [(2*dHf CO2)+(3*dHf H2O)]-[dHf C2H6]
Wednesday, June 19, 2013 at 10:21pm by DrBob222

Chemistry
You use the Kf for the solvent that is in the problem. This problem wants to know the amount of fructose that can be added to PURE WATER (so you use Kf = 1.86). If benzene acted as the solvent you would use the Kf for benzene, for naphthalene you would use Kf for naphthalene, ...
Thursday, February 16, 2012 at 10:17pm by DrBob222

chemistry
(2 x 10^3)-(1.0 x 10^3) = delta (difference) = 1.0 x 10^3 Do the same for the others (always subtracting the smaller from the larger), then average by adding and divide the sum by 4. . Do the same with the other values.
Wednesday, July 14, 2010 at 11:02pm by DrBob222

name the 3 landforms in mississippi and describe each one. bayou- is a marshy stream that moves very slowly into another body of water. plain is an area of mostly flat land. delta- created by two river.
Wednesday, August 20, 2008 at 7:19pm by Sue

Chemistry
What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction? 2C6H6(l)+15O2(g)-->12CO2(G)+6H2O(g) :delta:Hrxn=-6278kj
Monday, July 6, 2009 at 4:58pm by Gweedo8

chemistry
Mass Hg x specific heat Hg x delta T = 381 Solve for mass Hg.
Thursday, April 16, 2009 at 7:36pm by DrBob222

Chemistry
With a platinum catalyst, ammonia will burn in oxygen to give nitric oxide, NO. 4NH3 + 5O2 -----> 4NO + 6H2O Delta H= -906 kJ What is the enthalpy change for the following reaction? NO + 3/2H2O ---> NH3 + 5/4O2
Tuesday, October 30, 2007 at 11:29pm by Lauren

Chemistry
Consider the combustion of propane: C3H8 + 5CO2 -> 3CO2 + 2H20. Delta H = -2221 kJ. What mass of propane must be burned to furnish this amount of energy assuming the heat transfer process is 60.% efficient?
Monday, October 11, 2010 at 1:19am by Anonymous

Chemistry
A .25 g chunk of sodium metal is cautiously dropped into a mixture of 50g of water and 50 g of ice both at 0 C 2Na(s) + 2h2o(l) -> 2naoh(aq) + H2 Delta H = -368 kj Will the ice melt ..
Friday, May 24, 2013 at 8:16am by Diep

chem-help pls!
How much heat is transferred to the water? q = massH2O x specific heatH2O x delta Tof H2O = ?? J Then convert 0.975 g CaO to mols and divide to obtain J/mol. Convert that to kJ/mol.
Monday, February 25, 2008 at 1:06pm by DrBob222

chem 1406
Consider: C7 H16(L) + 11 O2 (G) yields 7 CO2 + 8 H2O (L) delta Hreaction = -4130 kJ How much energy is released when 2,000 moles of C7 H16 is combusted?
Tuesday, April 27, 2010 at 12:19am by laney

Chemistry(DrBob222)
the procedure is no more precise really, I understand the lab, if i can ask a different question then, when delta g is negative and becoming less negative (or more positive), why is this happening over a decrease in temperature (increase in volume)
Monday, December 9, 2013 at 7:24pm by K

chemistry
To be polar you must have these TWO items (both of them). Just one won't do. a. You must have polar bonds meaning that the two atoms must have different electronegatives. b. The molecule must NOT be symmetrical (in 3D space). For example, CH4 has polar bonds because the ...
Sunday, February 23, 2014 at 5:20am by DrBob222

Gen Chem II
You did not give the web address for melting point or Kf value for camphor. We don't need the melting point but we need Kf. The only value I could find on the web was 40 so you should confirm that. delta T = Kf*m delta T = 4.56 Kf = 40 Solve for m 4.56 = 40*m m = 4.56/40 = 0....
Monday, February 11, 2013 at 5:28pm by DrBob222

Chemistry
Hydrogen H2 is used as a rocker fuel. The hydrogen is burned in oxygen to produce water vapor. 2H2 + O2 ----> 2H2O Delta H = -484 kJ What is the enthalpy change per gram of hydrogen?
Tuesday, October 30, 2007 at 11:33pm by Lauren

Physics
Calculate the minimum change in velocity (delta v or ∆v) required for the space shuttle to decrease its altitude to 60 miles when it’s orbiting with an apogee of 246 miles and a perigee of 213 miles above the surface of Earth.
Thursday, December 26, 2013 at 3:28am by Anonymous

college chemistry-thermochemistry
I got: delta H= 482.79J 482.79/150gNH4NO3 x 80gNH4NO3/mol NH4NO3 =2574.88J/mol =2.575 kJ/mol Is this right?
Saturday, November 8, 2008 at 8:49pm by maryanne

Chemistry
The following reaction has a Delta G value of 42.6 kJ/mol at 25oC: HB(aq) +H2O(l) --> H3O+(aq) +B-(aq) Calculate Ka for the acid HB.
Monday, May 7, 2012 at 1:28pm by Jake

chemistry
a) q1 = heat needed to transform 100 C liquid water to 100 C steam. q1 = mass water in grams x heat fusion b) q2 = heat needed to transform zero C liquid H2O to liquid water at 100 C. q2 = mass H2O in grams x specific heat water x delta T (delta T is 100-0=100). q3 = heat ...
Tuesday, December 14, 2010 at 8:25am by DrBob222

CHEMISTRY
You know the delta T for the metal and the water. heat=masswater*cw*deltaT +massnickel*cn*deltatT b) use that heat, per mole of acetone consumed (convert grams to moles) c) Use Hess'law.
Sunday, September 30, 2007 at 10:37pm by bobpursley

chemistry
For part d, the heat of solution is a negative number since placing the salt in water made the T rise from 24.5 to 31.8, that makes it an exothermic reaction, and that means delta H is negative. It gives off heat.
Saturday, July 19, 2008 at 1:47am by DrBob222

physics
I'm very confused. What is the range of an arrow shot horizontally at 85.3 m/s if it is initially 1.5m above the ground? I'm guessing 1.5 is delta Y and initial velocity at 85.3 m/s and final velocity at 0 m/s. I just don't understand how I'm supposed to get the answer.
Monday, September 15, 2008 at 9:39pm by yeh

Chemistry
delta T = Kb*molality Solve for m m = moles solute/kg solvent Before going further, are you sure you have copied the problem correctly? There is a difference between 500 g SOLUTION and 500 g SOLVENT.
Monday, November 8, 2010 at 12:27pm by DrBob222

Chemistry
1) Consider the formation of sulfur trioxide according to the reaction: 2 SO2(g) + O2(g) -> 2 SO3(g) delta H = -198 How much heat is evolved in the formation of 750 grams of SO3? I am not sure how to start this problem.
Friday, January 20, 2012 at 9:59pm by Hannah

Chem
2H2(g)+O2(g) ---> 2H2O(l) delta H= -572kJ/mole of O2 Calculate the amount of heat evolved when 10g of hydrogen are burned in excess oxygen. Can someone please explain step by step? =D
Sunday, July 15, 2012 at 10:08pm by Shirley

chem
How much heat (in {kJ}) evolves when 7.0L of C2H2(d = 1.0967kg/m^3) is mixed with a stoichiometric amount of oxygen gas? The combustion reaction is C2H2+ 5/2 O2-> 2 CO2+ H2O, Delta H=-1299.5 kJ
Monday, November 19, 2012 at 12:57pm by Chironjit

Chemistry
So calculate E for n = 9 (and Z is 2). Call that E1 Then calculate E for n = 4 (and Z is 2). Call that E2. Subtract the two (disregard the sign), then delta E = hc/wavelength. All of that gives you one line. That's the n = 0 to n = 4 transition. You will have other lines; for ...
Sunday, March 24, 2013 at 11:52pm by DrBob222

Chemistry
I wonder if this is the real problem? Isn't delta G = zero at the boiling point? It would have made more sense to ask for dS vap at the normal boiling point. And how could you calculate dG anyway with no dSvap given?
Tuesday, April 30, 2013 at 1:42am by DrBob222

chemmm helppppppppp
Rate= -1/2(⌂[N2O]/⌂t)=1/2(⌂[N2]/⌂t)=⌂[O2]/⌂t *⌂ is the delta sign
Sunday, February 1, 2009 at 12:10am by Anonymous

Earth Sci
A cobble-sized sediment is naturally broken off the steep sides of a valley in a mountainous region. The sediment falls onto a glacier that occupies much of the valley. Over several years, the sediment “falls through” the glacier and is then dragged along the glacier’s bottom...
Wednesday, January 7, 2009 at 8:17pm by Ivy

physics
(i) the magnetic flux as a function of the current ‘i’, and (ii) the magnetic flux if a gap of width delta^2 < < A) is cut in the ring
Wednesday, June 17, 2009 at 1:59am by Sandhya

chemistry
q = mass water x specific heat water x delta T. I would convert heat to Joules and mass sample to grams to start.
Friday, February 5, 2010 at 4:22pm by DrBob222

chemistry
Using data in table below and S °(CaSO4·H2O(s))= 194.0 J·mol-1·K-1, calculate Delta fS° for CaSO4·H2O(s) in J·mol-1·K-1.
Thursday, May 13, 2010 at 8:05am by write2khin

Chemistry
reverse equation 1 and multiply by 4 reverse equation 2 and multiply by 3. Add the new 1 and 2. When you do this, delta H is multiplied by the multiplier and the sign is changed when reversed.
Sunday, November 13, 2011 at 9:38pm by DrBob222

Thermochemistry
heat in combustion as measured by the calorimeter = 60.8 kJ/K x (delta T) = ? kJ released. ?kJ released/deltaH in kJ/mol = #moles.
Sunday, December 4, 2011 at 8:57pm by DrBob222

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