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July 29, 2014

Search: A sample of 1.00 mol H20 is condensed isothermally and reversibly to liquid water at 100C

Number of results: 14,123

chem
the combustion of 1.83 grams of a compound which only contains C,H, and O yields 4.88 grams of CO2, and 1.83 grams of H2O. What is the empirical formula of this compound? ------------------------------------------ 4.88 g CO2 x 1 mol CO2/44.01 g CO2 x 2 mol O2= .2217 mol O2 1....
August 19, 2012 by greeny

chemistry
A sample of 1.00 mol H2O(g) is condensed isothermally and reversibly to liquid water at 100C. The standard enthalpy of vaporization of water at 100C is 40.656 kJ mol−1. Find w, q, ∆U, and ∆H for this process. ------------- I can solve for ∆H: n * ...
February 5, 2009 by chemstudent

Chemistry
A mixture of .10 mol of NO, .050 mol of H2 and .10 mol of H20 is placed in a 1 liter vessel at 300 K. The following equilibrium is established. 2 NO + 2 H2 <----> N2 + 2 H20 At equilibrium (N0) = .062 M. What are the equilibrium concentrations of H2 N2 and H20
March 29, 2010 by Thomas

Chemistry
A mixture of .10 mol of NO, .050 mol of H2 and .10 mol of H20 is placed in a 1 liter vessel at 300 K. The following equilibrium is established. 2 NO + 2 H2 <----> N2 + 2 H20 At equilibrium (N0) = .062 M. What are the equilibrium concentrations of H2 N2 and H20
March 29, 2010 by Thomas

Chemistry
Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of the condensed vapor. ...
December 15, 2011 by Mika

Chemisrty
Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in mole fraction of the condensed vapor. ...
December 1, 2011 by BB

Chemistry
Reposting with correct information..Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25C. The vapor above this solutionis collected and condensed. Using the following data, determine the composition in ...
December 8, 2011 by Minx

chemistry
I have a molar mass for a condensed vapor: 95.935 g/mol. What are a few of the potential identities of the unknown liquid from which the condensed vapor came from?
April 1, 2010 by Hannah

Chemistry
Steam at 100C was passed into a flask containing 250 g of water at 21C, where the steam condensed. How many grams of steam must have condensed if the temperature of the water in the flask was raised to 76C? The heat of vaporization of water at 100C is 40.7 kJ/mol and the ...
October 8, 2008 by Ryan

chemistry
at standard pressure, which has the highest average kinetic energy? a)H20(g) at 110 oC b)H20(s) at -10 oC c)H20(l) at 25 oC d)H20(l)(arrows going opposite directions)H20(g) at 70 oC e)H20(s)( arrows going opposite direction)H20(l) at 0 oC
September 26, 2011 by Anonymous

chemistry
In an esterification experiment, 2.0 mol of ethanol were mixed with 1.0 mol of ethanoic acid in a container of volume 30cm3 and the chemicals were allowed to come to equilibrium at 25, CH3CO2H + C2HOH <-> CH3COOC2H5 + H20 If the equilibrium mixture contained 0.845 mol ...
May 28, 2009 by Anonymous

AP Chemistry
Could you please review my work and see what i'm doing incorrectly? Thank you Given this information: CxHyOz (s) + O2 (g) ----> CO2 + H20 given: 2.165 g of the unknown hydrocarbon v = 1.868 L P = 130.2 kPa T = 65.0 degrees C g of H2O = 1.818 a)find g H in hydrocarbon 1.18g/...
February 5, 2008 by Jake

chemistry
what is the Molarity (M) of a 0.87m aqueous solution of ammonia, NH3? The density of the solution is 0.823 g/mL. Answer: 0.71 M So I have: 0.823 g H2O+NH3/1 ml H2O+NH3 17.034 g NH3/1 mol 18.016 g H2O/1 mol 0.87 mol NH3/1 kg H2O I've tried this several ways and I can't seem to ...
July 10, 2011 by molality--->molarity

CHEMISTRY
C12H20(Y)--> 22CH2=O+ 2CH3C(=O)CH2C(=O)CH3 The reagents used are ozone, Zn and H20 Give condensed formula of C12H20Y
November 12, 2007 by Delli

Chemistry
When CO2(g) (0.118 mol/L) and H2(g) (3.90 mol) in a 33.0 L reaction vessel at 980K are allowed to come to equilibrium the mixture contains 0.0853 mol/L of H20(g). What concentration (mol/L) of CO2(g) reacted? CO2(g) + H2(g) <--> CO(g) + H2O(g)
April 10, 2008 by Riley

Chemistry
A flask was immersed in 350 g of water at 25 degrees C. Steam at 100 degrees C was passed into this flask, and eventually condensed into water at 100 degrees C. If the temperature of the water surrounding the flask was raised to 70 degrees C, how many grams of steam must have ...
April 18, 2014 by Amanda

Chemistry
Find the thetrical formula for .012 mol of H20, .0056 moles of Cl2 and .0060 of copper with a formula like this CuCl*H20 *=point in center
September 24, 2012 by Brett

chemistry
Determine the number of representative particles in each of the following and identify the representative particle. a. 13.0 mol Ag b. 23.7 mol H20 c. 0.178 mol NaCl
January 13, 2010 by q

chemistry
determine the number of representative particles in each of the following and identify the representative particle: 11.5 mol Ag; 18.0 mol H20; 0.150 mol NaCL.
May 6, 2013 by jon

Chemistry
2CH3CH2CH2OH(l)+9O2(g)→6CO2(g)+8H2O(g) I have to find the delta G delta G of CH3CH2CH2OH(l)=−360.5 KJ/Mol delta G of O2(g)=0 KJ/Mol delta G of CO2(g)=−394.4 KJ/Mol delta G of H20(g)=−228.6 KJ/Mol I keep getting -3426.2 KJ/Mol but its not correct.
June 21, 2013 by dave

Chemistry
Delta H Vap (h20)=40.7Kj/mol How much water vaporized with 155Kj/mol?
April 22, 2011 by Joey

chemistry
For each of the following solutions, calculate the initial pH and the final pH after adding 0.010 mol of HCℓ. a) 500.0 mL of pure water i'm not sure how to do this question.. would the equation be h20+h30 equilibrium arrows h30+h20
December 1, 2010 by help

Chemistry
How much energy (in kilojoules) is released when 12.8 g of steam at 130.0 C is condensed to give liquid water at 73.5 C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K*Mol)for the liquid and 33.6 J/(K*Mol) for the vapor.
January 24, 2011 by Kevin

chemistry
How much energy (in kilojoules) is released when 12.3g of steam at 121.5degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67 kj/mol, and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol) for ...
January 25, 2010 by Lauren

chemistry
calculate3 the concentrationof chloride in water sample Mw using this equation mol Ag+ = 1= MxVwx10-3 = MxVw mol Cl- 1 Mwx20.00x10-3 Mwx20 so M x Vw=Mw x20 or Mw= M x Vw 20 Mw= ? mol/L chloride in water sample= ? mmol/L Mw=? g/L chloride in water sample Mw=?ppm in water sample...
June 2, 2012 by lynda

Chemistry
When 6200g of ethylene glycol and 16600g terephtalic acid reacted completely to generate poly(ethyleneterephtalate)(PET),how many grams of H20 generated? My working: mol of ethylene glycol = 6200g/(62g/mol) = 100 moles mol terephtalic acid = 16600g/(166g/mol) = 100 moles So,...
April 25, 2012 by Meenaakshi

Chemistry e
The rusting of iron is represented by the equation 4Fe +3O2 --> 2Fe2O3. If you have a 1.50-mol sample of iron, how many moles of Fe2O3 will there be after the iron has rusted completely? a. 0.50 mol b. 0.75 mol c. 1.0 mol d. 1.50 mol e. 2.0 mol --> I got "b" using ratios...
January 18, 2011 by Kaye

Chemistry
A solution is made by dissolving 0.100 mol of NaCl in 5.35 mol of water. What is the mass % of NaCl? So far, I have determined molecular weight of NaCl (58.44 g/mol) multiplied by 0.100 mol = 5.844g NaCl, and mw of H2O (18 g/mol) = 96g H20. I thought mass solute/mass solution...
March 26, 2010 by Jon

chemistry
How much energy (in kilojoules) is released when 12.3g of steam at 121.5 degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67kj/mol , and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol)for ...
January 20, 2010 by aamani

chemistry
How much energy (in kilojoules) is released when 12.3g of steam at 121.5 degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67kj/mol , and the molar heat capacity is 75.3 J/(K mol) for the liquid and 33.6 J/(K mol)for ...
January 20, 2010 by Lauren

chemistry
How much energy (in kJ) is released when 16.4 g of steam at 121.5 degrees C is condensed to give liquid water at 60.5 degrees C? The heat of vaporization of liquid water is 40.67 kJ/mol and the molar heat capacity is 75.3 J/(K*mol) for the liquid and 33.6 J?(K*mol) for the vapor.
January 24, 2012 by Becca

Chemistry ?
How many moles are contained in a 4.67-L sample of gas at 30C and 199 kPa? A. 1.7 mol B. 11.8 mol C. 0.37 mol D. 3.7 mol I guessed D, but I'm not sure.
August 15, 2013 by Kaylee

math who helps me step by step
25g of a sample of ferrous sulphate was dissolved in water contains dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. Calculte the percentage of f2s04 7 h20 in the sample My calculation 0.02 x 0...
January 4, 2014 by Fai

ap chemistry
The volume of 0.100 mol of helium gas at 34C is increased isothermally from 1.00 L to 4.50 L. Assuming the gas to be ideal, calculate the entropy change for the process.
April 12, 2013 by sarah

Chemistry
A sample weighing 3.064 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not react. If the sample residue weighs 2.407 g, ...
October 29, 2012 by Chris

GenChem II
What mass of CsBr must be added to .500L of water to produce .4molality solution? What are mole fraction and mass percent? Here is my work and below I will post a question about it: 1 mol CsBr = 212.81g density of water = 1g/mL d=mv 1=x/500 x=500g of water --> solvent ....
February 18, 2010 by Chem

chemistry thermodynamics
a sample of methane gas of mass 25g at 250k and 18.8atm expands isothermally until its pressure is 2.5atm. calculate the change in entropy.
October 19, 2013 by sam

Chem URGENT
How much energy (in kilojoules) is released when 13.3g of steam at 114.5∘C is condensed to give liquid water at 67.0∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6 J/(K⋅...
June 17, 2014 by Jess

chemistry
In raction NH3 + 5 O2 --> 4 NO + 6 H20 . I 1 mol NH3 and 1 mol O2. what is the limiting reactant? ow Much NO will form?
February 13, 2013 by Fakhrywik

Chemistry
enthalpy of combustion kj mol H2 + 1/2 o2 = h20 + 286 kJ how much did you see? 62.4 ml H2 1 mol of any gas at NTP = 24.5 L You need to clarify your question. Also define NTP.
March 8, 2007 by San

chem
the volume of 0.220 mol of an ideal gas at 34C is increased isothermally from an initial volume of 12.0 L. If the final volume is 21.5 L, calculate the entropy change for the process.
April 2, 2013 by hannah

Chem.
I was trying to find the molecular formula for CuSO4 . XH2O. I ended up with the ratio of 1 mol CuSO4 : 3.85 mol H20 Would I have to round 3.85 to 4 or use a multiplier?
November 24, 2012 by Anonymous

Chemistry
A 300.0g sample of ice at -30.OC is mixed with 300.0G of water at 90C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capazities of H2O(s) and H20(L) are 2.03 and 4.18 j/g*C respectivly, and the entahply fusion for ice is 6....
February 24, 2012 by Keru

Analytical chemistry
I did the next problem, i don't have the results for it and i just want to know if i calculated the mass for Fe2O3 the right? A sample is a mixture of iron oxides (Fe2O3 and FeOOH). It's known that at 200C this reaction occurs: 2FeOOH(s)-> Fe2O3(s) + H2O(g) A 0.2564g ...
September 7, 2013 by Gloria

Chemistry
The equlibrium constant K, for the reaction, H2 + CO2 <-> H20 + CO, is 4.2 at 1650 degrees C. Initially, 0.80 mol H2 and 0.80 mol CO2 are injected into a 5.0L flask. Calculate the concentration of each species at equilibrium.
March 18, 2012 by Kristen

Chemistry
One mole of nirtogen at 273K occupying 10 litres (state 1) is to be expanded to a volume of 20 litres at 373K (state 2). An infinite number of paths from state 1 to state 2 are possible. Consider the following important paths: (a) The gas is expanded isothermally and ...
January 8, 2009 by Alice

ap chem
The heat of combustion of propane is -2,220.1 kJ/mol calculate the heat of formation, delta Hf, of propane given that delta Hf of H20= -285.3 kJ/mol and delta Hf of CO2 = -393.5 kJ/mol
March 15, 2011 by Anonymous

chemistry
A 79.9-L sample of a gaseous hydrocarbon, measured at 1.00 atm pressure and 25.0C, is burned in excess oxygen, liberating 4.24 10^3 kJ of heat at constant pressure. What is the identity of the hydrocarbon? (R = 0.0821 L atm/(K mol)) Substance Hf (kJ/mol) CO2(g) 393.5 ...
March 30, 2011 by chemistry

Chemistry
A 10.00 g sample of He is compressed isothermally from a volume of 61.1 L to a volume 2.00 L at a temperature of 25 C. Calculate the work done by the gas on the surroundings if the external pressure is 101.325 kPa.
April 9, 2012 by sol

Physical Chemistry2
One mole of a van der Waals gas with a=15.0 l^2 atm mol^−2 and b=0.015 l mol^−1 is expanded reversibly and isothermally from 1 atm to 0.5 atm at a temperature of 300 K. Calculate w for this process, and compare it with that required to expand an ideal gas between ...
September 29, 2008 by Amber

equilbrium II
when CO2 (.15mol) and H2 (.302g) in a 500L vessel at 576'C are allowed to come to equilibrium the mixture contains .000183 mol/L of H20. what is the equilibrium concentration of CO? CO2 + H2 --> <-- CO +H2O The equilibrium concentration of H2O = the equilibrium ...
April 10, 2007 by christine

chemistry please help
calculate the concentration of silver nitrate in mol/L M x V =0.2 average Vw in ml of 2.23 2.26 2.43 MxVw = Mwx20 Mw=? mol/L chloride in water sample = mmol/L? =?g/L chloride in sample =?ppm chloride in water sample
June 4, 2012 by lynda

Chemistry
"An aqueous sodium borate solution is titrated to the second endpoint with 0.225 mol/l nitric acid in the presence of a suitable indicator. If an average of 12.6mL of titrant are required to reach the second endpoint for a 25.0 mL sample, what is the base concentration?" My ...
May 15, 2010 by Stuck

chemistry
Complete the folling reactions by writing the structures of the expected products & by naming the reactants & products HCl a) CH3COOCH3 + H20 ---> ? NaOH b) CH3CH2CH2COOCH2CH2CH3 + H20 ---> ? KOH C) HCOOCH2CH3 + H20 ---> ?
May 30, 2010 by sarah

chemistry
How many milliliters of 0.418 M HCl are needed to react with 52.7 g of CaCO3? 2HCl (aq) + CaCO3 (s) >>> CaCl2 (aq) + CO2 (g) + H20 (l) I got .00252 mL but its wrong. This is what I did: 52.7 g x (1 mol CaCO3/100.09 CaCO3) x (2 mol HCl/ 1 mol CaCO3)= 1.05 mol HCl ...
September 19, 2009 by Some kid

Chemistry problem
Hi I'm stuck on these questions can you please help me A soil sample contains 0.2234 g of Fe3+ per 100g. Fe3+ is precipitated when the soil becomes alkaline as shown in the equation below. Fe3+ + 3OH- + (x-1)H2O _ FeOOH.xH2O(s) This soil is sprayed with 40.0 wt% urea solution...
March 26, 2010 by Sarah

chemistry
The equilibrium constant (Kc) for the gas phase reaction 2 NH3 N2 + 3 H2 is 3.0 x 10-3 at some temperature. The reaction is started by placing a 0.040-mol sample of ammonia in an empty one-liter flask. When equilibrium is established how much N2 is present? 1. ) 0.019 mol 2...
October 25, 2009 by James

ap chemistry
A 0.456 gram sample of an unknown mono- protic acid (lets call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH. What is the molecular weight of the unknown acid HZ? 1. 103.2 g...
March 5, 2013 by cheri

Chemistry
When a sample of I(g) (18.15 mol) is placed in 59.00 L reaction vessel at 605.0 C and allowed to come to equilibrium the mixture contains 6.938 mol of I2(g). What is the concentration (mol/L) of I(g)? 2I(g) = I2(g)
October 4, 2013 by plzprovidetheanswer

Chemistry
A 2.612 g sample of a copper oxide, when heated in a stream of H2 gas, yields .592 g H20. What is the formula of the copper oxide? Again, I need help with this problem. Answer = CuO Ok nvm.. i got it. Set up the reaction as best we can surmise at the moment. CxOy + H2 ---> ...
August 25, 2005 by Laura

Physical Chemistry
Take 3.00 mol of an ideal gas at Pi=25.0 bar, Vi=4.50L, and expand it isothermally. Calculate the work done in two different processes. a. Reversible expansion at Pf=4.50 bar b. Irreversible expansion at Pext=4.50 bar
September 4, 2012 by Sarah Kennedy

Chemistry
When a sample of I2(g) (0.07249 mol/L) is placed in 130.0 L reaction vessel at 865.0 K and allowed to come to equilibrium the mixture contains 0.1110 mol/L of I(g). What concentration (mol/L) of I2(g) reacted? I2(g) = 2I(g)
October 4, 2013 by plzprovidetheanswer

Chemistry [back-titration] - please check my sol'n
A 7.00 gram sample containing the mineral tellurite was dissolved then treated with 70.0 mL of 0.03114 M K2CrO7. 3 TeO2 + Cr2O7 ^2- + 8 H+ -> 3 H2TeO4 + 2 Cr3+ + H2O When reaction is complete, the excess Cr2O7 2- required a 14.05 mL back titration with 0.1135 M Fe2+. ...
March 19, 2014 by Nina

Chemistry
CuSO4 + X h20 -> CuSO4 +xH20 ... a 9.6 g sample of CuSO4 was allowed to absorb water. After absorption the sample weighed 15.01 grams. What is the value of x?
October 9, 2010 by MAX

Chemistry
consider 2 sample of nitrogen gas. sample 1 contains 1.5 mol of N2 and has a volume of 36.7L at 25C and 1 atm. sample 2 has a volume of 16.5L at 25C and 1 atm. calculate the number of moles of N2 in sample 2 do i use the pv= nrt equation? and do i only use the information ...
June 8, 2010 by Anonymous

Chemistry
A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is: CaCO3(s)+2HCl(aq) -> CaCl2(aq) + H2O(l) + CO2(g) The excess HCl(aq) is titrated by 9.75 mL of 0.125 M NaOH(aq). Calculate the mass percentage of CaCO3(s) in ...
April 10, 2012 by Katherine

chemistry
Given that the specific heat capacities of ice and steam are 2.06 J/gC and 2.03 J/gC, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/gC, calculate the total quantity of ...
February 16, 2010 by Emily

CHEMISTRY
Given that the specific heat capacities of ice and steam are 2.06 J/gC and 2.03 J/gC, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/gC, calculate the total quantity of ...
November 2, 2010 by Riley

AP Chemistry
Consider a 50.4 g sample of H2O(g) at 115C. What phase or phases are present when 156 kJ of energy is removed from this sample? Specific heat capacities: ice, 2.1 J/gC; liquid, 4.2 J/gC; steam, 2.0 J/gC, Hvap = 40.7 kJ/mol, Hfus = 6.02 kJ/mol. (Select all that apply...
November 28, 2008 by Robert

AP Chem
The energy change H associated with the reaction NBr3(g) + 3H2O(g) -> 3HOBr(g) + NH3(g) is +81 kJ/mol rxn. These bond energy values might be useful: O-H 459 kJ/mol; N-H 386 kJ/mol; O-Br 201 kJ/mol. The strength of the N Br bond is 1. 4 kJ/mol 2. 465 kJ/mol 3. 66 kJ/mol 4. ...
November 7, 2010 by Beth

Chemistry 2 Ap
If 10.0 g of hydrogen gar reacts with 20.0 g of oxygen gas, how much water will be made? So far this is all i have: (10.0g H2/1)(2molH2/2.02H2) = 9.0099 mol H2 (20.0g O2/1)(2mol O2/32g O2) = 1.25 mol O2 With the limited reactant being O2 Now what do i do? I also have to find ...
September 10, 2008 by jecce.

chemistry
a 25.0ml dsmplr og 0.105M HCI was titrated with 31.5ml of NaOH. What is the concentration of the NaOH I got 0.0834M am I correct HCI + NaOH -----> H20 + NaCl 25.0ml HCI x 1L/1000mlx0.105 mol HCI/1L HCI X 1 mol NaOH/ I mol HCI = 0.0834M
November 10, 2011 by Monique

Chemistry
A rock sample contains only Sb2S3 and FeS. If 835g of the sample contains 11.2% antimony, what is the mass percent of the Sb2S3 in the sample? What is the mass percent of the sulfur in the sample? So far, I have determined that 11.2% of an 835g sample is 93.52g Sb, the molar ...
August 31, 2012 by Kristin

AP Chemistry
At 298K and 1 atm, a 0.5 mol sample of O2 and a seperate 0.75 mol sample of CO2 gas have the same: A. mass B. density C. average molecular speed D. average molecular kinetic energy E. number of atoms Please explain, and thanks for helping!
November 6, 2013 by Elizabeth

chemistry
which pair of substances are most likely to obey Raoult's Law? C5H12 and C6H14 H3PO4 and H20 C4H9COOH and C5H12 C5H12 and H20 C4H9COOH and H20 How do I go about figuring this out? What should I be comparing, differences in molar masses, polarity, etc...?
February 2, 2010 by Anonymous

ap chemisty
Calculate the heat of formation of butane given that the heat of formation of H20(l) is -285.3 kj/mol and the heat of formation of CO2(g) is -393.5 kj/mol.
September 24, 2010 by Sarah

chemistry
Which of the following mixtures will be a buffer when dissolved in a liter of water? a. 0.1 mol Ca(OH)2 and 0.3 mol HI b. 0.3 mol NaCl and 0.3 mol HCl c. 0.4 mol NH3 and 0.4 mol HCl d. 0.2 mol HBr and 0.1 mol NaOH e. 0.2 mol H3PO4 and 0.1 mol NaOH i think e is answer but not ...
May 21, 2010 by George2

chemistry
A 250.0 mL sample of an aqueous solution at 25 degrees Celsius contains 35.8 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 11.25 mmHg, what is the molar mass of the unknown compound? a.) 237 g/mol b.) 484 g/mol c.) 351 g/mol d.) 699 g/mol...
October 2, 2012 by Bru

college chemistry
When a sample of HI(g) (5.825 mol) is placed in 320.0 L reaction vessel at 702.0 K and allowed to come to equilibrium the mixture contains 1.052 mol of H2(g). What is the equilibrium concentration (mol/L) of HI(g)? 2HI(g) = H2(g)+I2(g)
October 12, 2010 by sparkle

CHEMISTRY- answer check
A 0.386g sample of a protein was dissolved in water and made up to a volume of 60mL at 21.0C. At this temperature the osmotic pressure of this solution was 1.24mmHg. Calculate the molecular mass of the protein 12682 g mol-1 95025 g mol-1 9627613 g mol-1 5706 g mol-1 125.17 g ...
October 9, 2010 by lulu

chemistry
Hi can you help me balance these equations? I did the first three but I don't think I did them right... 1. C3H8+O2> CO2 +H20 I balanced this one like this: C3H8+5O2>3CO2+4H20 2. C4H10+O2>CO2+H20 balanced: C4H10+O2>2CO2+5H20 3. C8H18+O2>CO2+H20 balanced: C8H18+O2...
February 19, 2008 by JackS

physics
A cylinder with a movable piston holds 2.75 mol of argon gas at a constant temperature of 295 K. As the gas is compressed isothermally, its pressure increases from 101 kPa to 121 kPa. Find (a) the final volume of the gas, (b) the work done by the gas, and (c) the heat added to...
October 31, 2011 by Matthias Schwartzkopf

AP Chemistry
The equilibrium constant for thermal dissociation of F2 F2(g)<->2F(g) is 0.300. If initially 1.00 mol F2 is placed in a 1.00 L container, which of the following is the correct number of moles of F2 that have dissociated at equilibrium? 1. 0.130 mol 2. 0.418 mol 3. 0.548 ...
November 26, 2013 by Gabriella

chemistry
A sample of naphthalene (C10H8) that has a mass of 0.7200 g is burned in a bomb calorimeter. The mass of the calorimeter is 1.580 kg, and its specific heat is 2.55 J/(g C). As a result of the reaction, the temperature of the calorimeter increases from 22.00C to 29.3C. If 1 ...
August 22, 2013 by sean

chemistry
Calculate the delta H for the reaction N2H4(l)+ O2(g) --> N2(g) + 2H20(l) Given the following data: 2NH3(g) + 3N20(g) --> 4N2(g) + 3H20(l) N20(g) + 3H2(g) --> N2H4(l) + H20(l) 2NH3(g) + 1/2O2(g) --> N2H4(l) + H20(l) H2(g) + 1/2O2(g) --> H20(l)
October 28, 2009 by kilo

Chemistry
Calculate the enthalpy change of formation for the following reactions using Hess's law, and the enthalpies of formation given in Figure 4: b) MgO +2HCl --> MgCl2 +H2O c)NaOH+ HCl -->NaCl +H20 Figure4: the given enthalpies of formation compound values are: Mg(OH)2 is ...
January 30, 2014 by BOB

analytical chemistry
at elevated temperature, NaHCO3 (83.98g/mol) is converted quantitatively to Na2CO3 (105.98g/mol).Ignition of 0.3592g sample of an antacid tablet containing NaHCO3 and non volatile impurities yielded a residue weighing 0.2362g. Calculate the percent purity of the sample.
January 26, 2014 by Anonymous

CHEM
Which of the following mixtures will result in the formation of a buffer solution when dissolved in 1.00 L of water? i) 0.50 mol NaOH and 0.50 mol HCl. ii) 0.50 mol NaCl and 0.25 mol HCl. iii) 0.50 mol NaF and 0.25 mol HF. iv) 0.50 mol NaOH and 0.25 mol HF. v) 0.25 mol NaOH ...
July 23, 2010 by B

Chemistry
A 2.52g sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess O to yield 4.36g of CO2 and 0.892g of H20. Another sample of the same compound of mass 4.14g, yielded g of SO3. A third sample, of mass, 5.66g, yielded 2.80 g of ...
September 6, 2010 by Christina

chemistry
given the following info for water molar heat of fusion 6.02kj/mol calculate the total quanity of heat evolved when 10.0g of steam is condensed,cooled,and frozen to ice at -50 degrees
April 5, 2011 by jewel

chemistry
given the following info for water molar heat of vaporization 40.6kj/mol calculate the total quanity of heat evolved when 10.0g of steam is condensed,cooled,and frozen to ice at -50 degrees
April 12, 2011 by jules

chemistry
I did an experiment with a sand sample which contains fine metallic aluminium and I wanted to measure how much of this metallic aluminium is in the sample. I used the NaOH solution in order to let react the aluminium and collect the H2. From the H2 amount I thought I could ...
November 25, 2010 by Leny

chemistry(just need to clarify, no need to solve)
When a sample of NO2(g) (5.641 mol) is placed in 360.0 L reaction vessel at 716.0 K and allowed to come to equilibrium the mixture contains 3.412 mol of NO(g). What is the equilibrium concentration (mol/L) of NO(g)? When a sample of PCl5(g) (1228 grams) is placed in 270.0 L ...
April 12, 2010 by bme1

Chemistry
Hey i have an idea how to do this but am not sure could you please help and show work. 12 moles of a gas sample at an initial temperature of 12 degrees celcius at a pressure of 200 Pa is allowed to expand isothermally and reversibly against a pressure of 50 kPa. Calculate the ...
January 18, 2013 by Dermot

Chemistry
Determine the Concentration of OH^-1 and pH of a solution that is 0.140 M F^-1. I did F- +H20 ---> HF + H20 but idk what to solve from there....
February 28, 2012 by ALISON

AP Chemistry
Calculate delta H fro the following equation: H20(l, 50.0 C) yields H20(s, -10.0 C)
January 23, 2013 by Katelyn

chemistry
Why is balanced chemical equation for H2O written 2H2+0>2H20 and not H20>H20?
September 21, 2009 by jo

Chemistry
I just completed a titration lab and the balanced equation is (8H^+)+MnO4^- + 5Fe (^2+) ---> Mn + 4 H20 + 5 Fe(^3+) I'm supposed to calculate the moles of permanganate, Fe^2+ and the mass of iron from the sample. The volume of permanganate is 33.5, and the concentration is ...
September 3, 2007 by Sven

chemistry (need by 5!!)
use the van der waals equation to calculate the pressure of 4.00 mol of H20 at 471K in a 4.60-L vessel. how do you solve?
April 26, 2013 by Katherine

Chem
You have a 46.0 G sample of H20 at a temperature of -58.0*C. How many joules of energy are needed to heat the ice to 95.3*C?
May 14, 2012 by Joel

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