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August 1, 2014

Search: Calculate the pressure exerted by 0.4961 mol of N2 in a 10.290-L container at 25.0°C. (See the table given below.)

Number of results: 28,786

CHEMISTRY!! NEED IMMEDIATE HELP PLEASE!!!
a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...
October 30, 2011 by Natasha

chemistry
given 2C6H6+15O2->12CO2+6H2O 1. Starting with a confined volume of 4.80L and O2 with a partial pressure of 223.1 torr at 25 degrees C. C6H6 is in excess. The reaction is allowed to proceed to completion. The container is returned to 25C. Both liquid water and benzene are ...
November 13, 2012 by stacy

chemistry
given 2C6H6+15O2->12CO2+6H2O 1. Starting with a confined volume of 4.80L and O2 with a partial pressure of 223.1 torr at 25 degrees C. C6H6 is in excess. The reaction is allowed to proceed to completion. The container is returned to 25C. Both liquid water and benzene are ...
November 13, 2012 by stacy

Chemistry
At a particular temperature a 2.0 liter flask contains 2.0 mol of H2S, 0.40 mol of H2, and 0.80 mol of S2. Calculate the equilibrium constant for the reaction: 2H2(g) + S2(g) <--> 2H2S(g)
January 18, 2008 by Sue

physics
An ideal gas is enclosed in a cylinder with a movable piston on top of it. The piston has a mass of 8,000 g and an area of 5.00 cm2 and is free to slide up and down, keeping the pressure of the gas constant. (a) How much work is done on the gas as the temperature of 0.230 mol ...
April 29, 2013 by Annette

physics
An ideal gas is enclosed in a cylinder with a movable piston on top of it. The piston has a mass of 8,000 g and an area of 5.00 cm2 and is free to slide up and down, keeping the pressure of the gas constant. (a) How much work is done on the gas as the temperature of 0.230 mol ...
April 29, 2013 by Annette

physics
An ideal gas is enclosed in a cylinder with a movable piston on top of it. The piston has a mass of 8,000 g and an area of 5.00 cm2 and is free to slide up and down, keeping the pressure of the gas constant. (a) How much work is done on the gas as the temperature of 0.230 mol ...
April 29, 2013 by Annette

chemistry
calculate the lattice energy of sodium oxide (Na2O) from the following data: Ionization energy of Na(g): 495 kJ/mol Electron affinity of O2 for 2e: 603 kJ/mol Energy to vaporize Na(s): 109 kJ/mol O2(g) bond energy: 499 kJ/mol Energy change for the reaction 2Na(s)+ 1/2 O2(g)--&...
September 14, 2012 by Meeeee

Chemistry - Urgent Please help!!
The problems: 0.0513 grams of Al (Wt. 27.0) was reacted with excess HCI to produce H2 according to the following balanced equation: 2 Al + 6 HCI ---> 2 AlCl3 + 3 H2 a) Determine the number of moles of H2 evolved from that quantity of Al when collected over water? 0.0513g Al...
April 23, 2013 by Kishwa

Chem hw!
1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas at 759 mm Hg pressure ...
March 11, 2010 by Teisha

Chem hw!
1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas at 759 mm Hg pressure ...
March 11, 2010 by Teisha

PHYSICS
Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean? ________N (b) What is the weight of a 10...
November 8, 2012 by Amy

chemistry
Calculate values of for the following sparingly soluble solutes. Calculate value of Ksp for AgI (delta Gf(Ag^+)=77.11 kj mol^-1 , delta Gf(I^-) =-51.57 kJ mol^-1, delta Gf(AgI) =-66.19 kJ mol^-1).
December 2, 2012 by Allyx3

chem 321
Calculate the total pressure at 8.0km , assuming a mean molecular mass of 28.9 g mol−1 and that T = 300. K throughout this altitude range.
September 17, 2013 by Nigora

Chemistry
a. Calculate the delta H, delta G, and equilibrium constant for the reaction of methane with Cl2 to give CH3Cl and HCl. Use the following information for your calculations: Bond Dissociation Energies: CH3-H (104.8kcal/mol), Cl-Cl(59.0 kcal/mol), CH3-Cl(85.0 kcal/mol), and H-Cl...
October 30, 2011 by Jennifer

AP Chemistry
Calculate the entropy change when 4.44g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g)→2H2O(ℓ) at 298 K and 1 atm pressure. The stan- dard molar enthalpy of formation of H 2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free energy of ...
October 29, 2013 by Gabriella

Chemistry
Need help in AP chemistry on Equilibrium When heated, hydrogen sulfide gas decomposes according to the equation 2 H2S(g) ⇄ 2 H2(g) + S2(g) A 3.40 g sample of H2S(g) is introduced into an evacuated rigid 1.25 L container. The sealed container is heated to 483 K, and 3.72 ...
April 9, 2012 by Sam

Chemistry
"Given that the bond enthalpy of the carbon-oxygen bonds in carbon monoxide and carbon dioxide are 1073 kJ/mol and 743 kJ/mol respectively, and that of the bond in the oxygen molecule is 496 kJ/mol, calculate the enthalpy change for the combustion of 1 mole of carbon monoxide...
April 8, 2010 by Stuck

science
1. the molar mass of helium is 4.00 g/mol. calculate the volume of 1 mol of helium at STP (T = 273, P = 1 atm) what is the density of helium at STP? 2. the density of an ideal gas is 1.35 kg/m^3. if the temperature is Kelvin and the pressure are both doubled, find teh new ...
April 23, 2008 by billystar

Chemistry (entropy)
Calculate the Ksp of CaF2 (2 is subscript). The problem wants it calculated with all or one of the following: G = -1162 kJ/mol H = -1215 kJ/mol S = 68.87 J/mol*k The answer is 1.55*10^(-10). How do I do this?
April 24, 2008 by help please

Chemistry
Using data in table below and S (NaCl(s))= 72.38 Jmol-1K-1, calculate fS for NaCl(s) in Jmol-1K-1. Compound S , Jmol-1K-1 Compound S , Jmol-1K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8
May 26, 2011 by Roxanne

Chemistry
Using data in table below and S (NaCl(s))= 72.38 Jmol-1K-1, calculate fS for NaCl(s) in Jmol-1K-1. Compound S , Jmol-1K-1 Compound S , Jmol-1K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8
May 26, 2011 by Roxanne

Chemistry
What will be the vapor pressure at 25 degree C of a 30.0% (by mass) solution of glucose, C6H12O6 (a non-electrolyte-molar mass = 180 g/mol), in water? The vapor pressure of water at 25 degree C is 23.8 mm Hg. Psolvent = XsolventPosolvent. You will need to calculate the mol ...
January 31, 2007 by AndrewN.

Chemistry
Using data in table below and S (NH3(g))= 192.5 Jmol-1K-1, calculate fS for NH3(g) in Jmol-1K-1. Compound S , Jmol-1K-1 Compound S , Jmol-1K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8
June 3, 2010 by Darali

Chemistry
Benzene has a vapor pressure of 100.0 Torr at 26C. A nonvolatile, nonelectrolyte compound was added to 0.309 mol benzene at 26C and the vapor pressure of the benzene in the solution decreased to 60.0 Torr. What amount (in moles) of solute molecules were added to the benzene...
February 15, 2010 by Angelica

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

Chem
Consider the reaction H2S(g) <==> H2(g) + 1/2S2(g) At 1065*C the partial pressure at equilibrium of hydrogen sulfied, hydrogen and sulfur are found to be .670 atm, .221 atm, and .110 atm, respectively. Find Kp and delta-G* for the reaction. Find delta-G for the reaction ...
April 16, 2007 by Jessica

Chemistry
An open-ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Atmospheric pressure is 750. mmHg. What is the pressure (in mmHg or torr) of the trapped gas if h =23 cm? I got 893.462, but that wasn't right. Can someone help ...
December 5, 2012 by Anonymous

Chemistry
A 0.528 gram sample of a metal, M, reacts completely with sulfuric acid according to: M+H2SO4 -> MSO4+H2 A volume of 205 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and...
October 17, 2012 by Bill

physic
Before practicing his routine on the rings, a 67 kg gymnast hangs motionless, with one hand grasping each ring and his feet touching the grounnd. Both arms make an angle of 24 degrees with the vertical.(a) If the force exerted by the rings on each arm has a magnitude of 290 N...
November 6, 2011 by taylor

CHEM
Vapor pressure is the pressure exerted by a vapor when condensation: A. < B. = C. > evaporation over its liquid in a closed system.
February 1, 2009 by joey

Chemistry
Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free energy ...
October 14, 2012 by sam

Chemistry
Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free energy ...
October 14, 2012 by Austin

Chemistry;HELP
1. A sample of gas under a pressure of 622 kPa has a volume of 233 cm3. The pressure is increased to 988 kPa, while the temperature remains constant. What volume will the gas occupy at this pressure? 2. The pressure exerted by a gas is 2.0 atm while it has a volume of 350 cm3...
August 21, 2013 by Unknown

CHEMISTRY!! D:
1. A sample of gas under a pressure of 622 kPa has a volume of 233 cm3. The pressure is increased to 988 kPa, while the temperature remains constant. What volume will the gas occupy at this pressure? 2. The pressure exerted by a gas is 2.0 atm while it has a volume of 350 cm3...
September 3, 2013 by Unknown

HELLO I NEED HELP AND NOBODY EVER HELPS ME.
1. the molar mass of helium is 4.00 g/mol. calculate the volume of 1 mol of helium at STP (T = 273, P = 1 atm) what is the density of helium at STP? 2. the density of an ideal gas is 1.35 kg/m^3. if the temperature is Kelvin and the pressure are both doubled, find teh new ...
April 23, 2008 by billystar

Chemistry
PLEASE fully explain these...I've already tried to figure them out and failed terribly... thanks so much 4. 5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: At equilibrium, there is 4.8 x 10-5 mol of B. Calculate...
May 17, 2012 by Katie

chemistry
Assume 5 mol of N2 gas is confined in a 10 L container at 523 K. calculate the pressure of the gas in kilopascals and in atmospheres.
May 18, 2009 by RW2010

chemistry
calculate the pressure,in atmospheres, of 2.00 mol helium gas in a 10.0-L container at 27 celcius? Please i don't understand any of this? help please?
October 16, 2010 by Shayla

chemistry
Calculate the pressure of 0.55 mol NH3 gas in a 2.00 L vessel at 25 celsius, using ideal gas law.
October 19, 2010 by lavonne

chemistry
The heat of vaporization of bromine at its boiling point (59.6 C) at 1.00 atm is 29.54 kJ/mol. Calculate the vapor pressure of bromine at 37.8 C.
January 22, 2012 by WLP

Chemistry
Calculate the amount of energy in kilojoules needed to change 225 g of water ice at -10 C to steam at 125 C. The following constants may be useful: Cm(ice)=36.57 J/(mol*C) Cm(water)=75.40 J/(mol*C) Cm(steam)=36.04 J/(mol*C) Delta H(fus)=+6.01 kJ/mol Delta H(vap)=+40.67 kJ/mol
April 17, 2010 by Eddie

chemistry
last check: (c) A wine cooler contains 4.5% ethanol by mass. Assuming that only the alcohol burns in oxygen, how many grams of wine cooler need to be burned to produce 3.12 L of CO2 (d = 1.80 g/L at 25C, 1 atm pressure) at the conditions given the density? 1 C2H5OH + 3 O2 = 2...
October 12, 2008 by starlight

AP Chem
At a particular temperature, K = 1.00 102 for the following reaction. H2(g) + I2(g) 2 HI(g) In an experiment, 1.23 mol H2, 1.23 mol I2, and 1.23 mol HI are introduced into a 1.00 L container. Calculate the concentrations of all species when equilibrium is reached.
January 8, 2012 by Bill

Chem Home Work Help!
I am a bit confuse with a question from a home work that I need to do by today please help! HW question... 1) A sample of neon gas occupies 8.77 L at 20C. What is the pressure, in atmospheres, exerted by 1.45 mol of this gas? When you've gotten the answer to this question you...
April 29, 2008 by Sujeil

Chemistry
Using the van der Waals equation, determine the pressure of 436.0g of SO2(g) in a 7.30-L vessel at 725k.? For SO2(g), a=6.865L^2atm/mol^2 and b=0.05679L/mol. (R=0.0821Latm/(Kmol))
March 5, 2012 by Cynthia

College Chemistry
The initial concentration for the compounds involved in the reaction shown were determined to be [CH4(g)] = 0.6616 mol/L, [H2O(g)] = 0.8127 mol/L, [CO(g)] = 0.9566 mol/L, [H2(g)] = 0.7688 mol/L. Calculate the value of the equilibrium constant (Kc) at 1200 K if the equilibrium ...
June 12, 2012 by Morgan

Chem
The boiling point of ethanol is 78.5C and delta H vap = 40.5kJ/mol. Calculate the vapor pressure (in torr) of ethanol at 0.0C ?
March 9, 2010 by Staci

College Chemistry
The value of ΔGf at 25C for gaseous mercury is 31.85 KJ/mol. What is the vapor pressure of mercury at 25C? [Hint: calculate the Kp for the reaction Hg(l)=Hg(g)]
December 6, 2010 by alice

Chemistry
The boiling point of ethanol is 78.5C and delta H vap = 40.5kJ/mol. Calculate the vapor pressure (in torr) of ethanol at 0.0C ?
March 15, 2012 by Christina

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

Attn: DrBob222
A .326L container holds 0.146g of Ne and an unknown amount of Ar at 30C and the total pressure is 627 mmHg. Calculate the moles of Ar present? (I have calculated temp 308K, pressure is 0.825 atm and moles of Ne are .007) Chem - DrBob222, Wednesday, March 3, 2010 at 3:25pm T ...
March 4, 2010 by Staci

CHM
Calculate the molecular weight of a small protein if a 0.32 g sample dissolved in 161 mL of H2O has an osmotic pressure of 9.0 mmHg at 25 degree celcius. (R=0.0821 L X atm/K X mol)
January 13, 2013 by Robby

Chemistry
If 3.50 mol of A is mixed with 0.750 mol of B and the final pressure of the mixture is 3.25 atm, what are the partial pressures of A and B
June 8, 2014 by Briana

sciencee
1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas at 759 mm Hg pressure ...
March 9, 2010 by Teisha

Chem
What volume of NO measured at 1.1 atm and 1100 C, can be produced from 10.0 L of NH3 and excess O2 measured at the same temperature and pressure? Here is the balance equation 4NH3+3O2+4NO+6H20 So far this is what I have: (1.1 atm)(10.0L) __________________=.097mol NH3 .08201 x...
October 5, 2009 by Joe

Chemistry
Given that KH for CO gas at 25 OC is 9.71 x10-4 mol.L-1.atm-1. Calculate the mass of CO that would dissolve in 1.00 L of H2O if the partial pressure of CO is 1.38 atm.
February 15, 2011 by Chelsea

Chem7
Calculate the osmotic pressure (in torr) of a solution containing 17.15 mg of hemoglobin (molar mass 6.5 x 104 g/mol) in 12.8 mL of solution at 25 degrees C.
May 2, 2011 by Ryan

(12)Chemistry - Science (Dr. Bob222)
Calculate delta E for a process in which 88.0 g of nitrous oxide gas (N2O) is cooled from 165 ˚C to 65 ˚C at a constant pressure of 5.00 atm. The molecular weight of nitrous oxide is 44.02 g/mol, and its heat capacity at constant pressure, Cp, is 38.70 J/molK. A) - ...
May 8, 2014 by Ana

Chemistry
Diethyl ether is a volatile organic compound. the vapor pressure of diethyl ether is 401 mm Hg at 18 degrees celsius and the change in H vapor = 26.0 kJ/mol. Calculate the vappor pressure of diethyl ether at 25 degrees C.
November 6, 2012 by Ania

Chemistry
which conversion factor do you use to first calculate the number of grams of CO2 produced by tge reaction of 50.6 CH with O2? The equation for the complete combustion of methane is: CH4 (g) + 2o2 (g) ---> CO2 (g) +2H2o (l) a. 2 mol O2/1 mol CO2 b. 1 mol CH4/16.0g of CH4 c. ...
December 11, 2011 by qwert

chemistry
Calculate how many moles of productwould be produced if .310 mol of the first reactant were to react completely. (a) CO2 + 4 H2 CH4 + 2 H2O CH4 _____ mol H2O _____ mol (b) C3H8 + 5 O2 4 H2O + 3 CO2 H2O _____ mol CO2 _____ mol (c) 3 H2SO4 + 2 Fe Fe2(SO4)3 + 3 H2Fe2(SO4...
January 6, 2011 by Anonymous

chemistry
The vapor pressure of benzene, C6H6, is 60.0 mm Hg at 13.5C. The molar heat of vaporization of benzene is 30.8 kJ/mol and R = 8.31 10-3 kJ/molK. What is the vapor pressure of benzene at 70.0C?
December 5, 2012 by Sam

CHEMISTRY
1. What is the vapor pressure at 25C of a solution of 1.20g of nephtalene C10H8 in 25.6g of benzone C6H6? The vapor pressure of pure benzene at 23C is 86.0mmHg the vapor pressure of naphthalene can be neglected. Calculate the vapor pressure lowering of the solution. 2. A ...
March 20, 2013 by N COMAS

chemistry
How many mol of Argon is required to exert a pressure of 1.00 MPa at 50 C in a vessel that has a volume of 14 litres? (R = 8.314 J K^-1 mol^-1)
July 6, 2014 by John

chemistry
The greatest pressure of the following is that exerted by: (a) a column of Hg 75.0 cm high (d=13.6 g/cm^3) (b) 10.0 g H2 gas at STP (c) a column of air 10 miles high; or (d) a column of CCl4 60.0 cm high (d=1.59 g/cm^3) The answer is b. I know that pressure=force/area and ...
November 2, 2011 by Holly

chemistry
1.)Calculate the number of moles in 3.50 x 10^21 atoms of silver. Show all work. 2.) Calculate the number of atoms in 2.58 mol antimony. Show all work 3.) Determine the mass of 1.45 mol FePO4. Show all work. 4.) Calculate the number of mol in 6.75 g of NaCl. Show all work. 5...
February 9, 2014 by Raina

chemistry
When 1.0 mol of ammonia gas in injected into a o.50L flask, the following reaction proceeds to equilibrium. 2NH3 <--> N2 (g) + 3H2 (g) At equilibrium, 0.30 mol of hydrogen gas is present. a) calculate the equilibrium concentrations of N2 and Nh3. b) what is the value of ...
November 26, 2006 by Luke

chem
A 1L flask is filled with 1.25 g of argon at 25 degrees celcium. A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm. What is the partial pressure of argon in the flask? Chemistry - DrBob222, Tuesday, October 5, 2010 at 9:00pm mols Ar = 1....
October 24, 2013 by kris

science
Calculate the final concentrations in mol/L of H+, Na+, Cl- and SO42- when the following three solutions are mixed together: 1000 cm3 of 0.10 mol dm-3 HCl 500 cm3 of 0.20 mol dm-3 NaCl 500 cm3 of 0.20 mol dm-3 of Na2SO4
June 23, 2012 by HADEEL

Chemistry
1) What is the vapor pressure at 25C of a solution of 1.20g ofnephtalene C10H8 in 25.6g of benzone C6H6? The vapor pressure of pure benzene at 23C is 86.0mmHg the vapor pressure of naphthalene can be neglected. Calculate the vapor pressure lowering of the solution. 2)A ...
March 19, 2013 by N comas

Chemistry
What pressure will be exerted by each of the gases in the following mixture if the total pressure of the mixture amounts to 768.8 torr? 0.500 g of hydrogen; 0.245 g of oxygen; 0.335 g of nitrogen. What do I need to do??
May 27, 2010 by jenny

general chemistry
Calculate the molar mass that would be obtained from the actul experimental data under the following conditions. The unknown is mehy propy ether (CH3OC3H7) which has the vapor pressure of 375.2 torr at room temperature, 20C. The volume of the flask is 135mL, the temperature of...
April 24, 2011 by Jasmine

Chemistry
The ΔHof of gaseous dimethyl ether (CH3OCH3) is 185.4 kJ/mol; the vapour pressure is 1.00 atm at 23.7oC and 0.526 atm at 37.8oC. a) Calculate ΔHovap of dimethyl ether. b) Calculate ΔHof of liquid dimethyl ether Any idead how to calculate for the heat of ...
December 11, 2012 by xavier

science (very important)!!!!
Calculate the final concentrations in mol/L of H+, Na+, Cl- and SO42- when the following three solutions are mixed together: 1000 cm3 of 0.10 mol dm-3 HCl 500 cm3 of 0.20 mol dm-3 NaCl 500 cm3 of 0.20 mol dm-3 of Na2SO4
June 23, 2012 by Hadeel

chemistry
calculate the freezing point and osmotic pressure at 25 degrees celcious of an aqueous solution containing 1.0 g/L of a protein (mm=9.0*10^4g/mol) if the density of the solution is 1.0 g/cm^3
February 8, 2010 by heather

Chemistry
What is the pressure in a 2.00 L container which holds 0.100 mol of methane and and 0.200 mol of carbon dioxide at standard temperature?
February 17, 2011 by Paul

Chem
What is the pressure in a 2.00 L container which holds 0.100 mol of methane and and 0.200 mol of carbon dioxide at standard temperature?
February 17, 2011 by Paul

chemistry
Calculate the following quantities. (See the periodic table.) (a) mass, in grams, of 2.54 10-2 mol of CdS g (b) number of moles of NH4Cl in 90.0 g of this substance mol (c) number of molecules in 5.081 10-2 mol C6H6 molecules (d) number of O atoms in 4.72 10-3 mol Al(NO3)3
August 2, 2012 by Anonymous

Chemistry
The vapor pressure of diethyl ether is 463.57 mm Hg at 25 degrees celsius. How many grams of aspirin C9H8O4, a non volatile nonelectrolyte (mw=180.1g/mol), must be added to 216.7g of ether to reduce the vapor pressure to 453.74 mm Hg. Ether=74.12g/mol This question is similar ...
February 19, 2012 by Hannah

chemistry
a)Calculate the pH of a solution of 0.75 M HNO3, which is a strong acid. b)Calculate the pH of a 1.0 L aqueous solution made from 0.80 mol CH3COOH and 0.20 mol KCH3COO (Ka = 1.8 x 10^-5).
May 9, 2013 by alex

Chemistry
A mixture of gases containing equal weights of carbon dioxide, carbon monoxide, and ammonia exerts an overall pressure of 450.0 torr. What pressure is exerted by each gas individually??
May 29, 2010 by jessica

Analytical Chemistry
When BaCl2-H2O (s) is dried in an oven, it loses gaseious water: BaCl2-H2O <--> BaCl2(s) + H2O (g) enthalpy change - 63.11 kJ/mol at 25 degrees C entropy change - +148 J/(K-mol) at 25 degrees C Calculate the vapor pressure of gaseous H2O above BaCl2-H2O at 298K.
October 25, 2010 by Tammy

Chemistry-Please help
If 1.00mol of argon is placed in a 0.500- container at 28.0 degree Celsius, what is the difference between the ideal pressure (as predicted by the ideal gas law) and the real pressure (as predicted by the van der Waals equation)? For argon,a=1.345(L square. atm)/mol square and...
October 16, 2009 by Rose

Chem- Dr bob! or GK!
Calculate the energy that must be removed to convert substance X from a gas at 116C to a solid -44.6C. Assume X has a molar mass of 75.0 g/mol. Hvap 20. kJ/mol C(s) 3.0 J/gC Hfus 5.0 kJ/mol C(l) 2.5 J/gC bp 75C C(g) 1.0 J/gC mp -15C please help! what formulas do i ...
November 29, 2008 by Rachelle

Chem
Can someone check these homework answers please? 32. The barometric pressure measured outside an airplane at 9 km was 259 mmHg. Calculate the pressure in kPa. 34.5 kPa 36. A diving bell is a container open at the bottom. As the bell descends, the water level inside changes so ...
November 11, 2008 by Anna

Chemistry
If you can show me an example of one problem, I have no idea how to approach this. Calculate where the number 40.67 came from. Use the Clapeyron-Clausisus equation. Assuming that delta H vap does not change with temperature, this equation relates the change in vapor pressure ...
February 26, 2012 by Angel

AP Chem
Would someone please check these for me? 52. In an experiment, you fill a heavy-walled 5.00-L flask with methane gas, CH4. If the flask contains 7.13 g of methane at 19 degrees C, what is the gas pressure? 2.14 atm 56. A 2.50-L flask was used to collect a 5.65-g sample of ...
November 19, 2008 by Anna

Chemistry
The vapor pressure of chloroform is 173.11 mm Hg at 25 degrees celsius. A nonvolatile, nonelectrolyte that dissolves in chloroform is aspirin. Calculate the vapor pressure of the solution at 25 degrees celsius when 6.243g of aspirin (180.1g/mol) are dissolved in 244.5g of ...
February 13, 2012 by Hannah

Chemistry
Calculate the partial pressure of monatomic hydrogen in hydrogen gas at 2000 K and 1 atm pressure. Given: (i) For ½ H2  H, Ho298=217,990 J; So298=49.35 J/K. (ii) Assume that the heat capacity of monatomic gas to be 3/2R (iii)The heat capacity of H2 assume to be 31 J...
March 31, 2012 by Plizzz help me

Chemistry
How would you calculate the pH of the buffer if 1.0mL of 5.0M NaOH is added to 20.0mL of this buffer? Can someone please explain to me how to do B and C step by step so I could understand it clearly? :) Say, for example, that you had prepared a buffer in which you mixed 10.30 ...
March 4, 2014 by Airin

Chemistry
How would you calculate the pH of the buffer if 1.0mL of 5.0M NaOH is added to 20.0mL of this buffer? Can someone please explain to me how to do B and C step by step so I could understand it clearly? :) Say, for example, that you had prepared a buffer in which you mixed 10.30 ...
March 5, 2014 by Airin

Chemistry
Consider the reaction: CO(g) + H2O (g) <---> CO2(g)+H2(g) which of the following initial composition will NOT achieve equlibrium? a) 0.25 mol H2, 0.35 mol CO2, and 0.25 mol CO b) 0.25 mol CO, 0.75 mol H2O c) 1.0 mol of CO2 and 0.50 mol H2 d) 0.85 mol CO and 0.25 mol H2 ...
November 9, 2012 by Ania

Physics!
A 0.3 kg brick is dropped form a height of 8 meters. It hits the ground and comes to rest. a) Calculate the impulse exerted by ground on the brick. b) It takes 0.0013 seconds from the time the brick first touches the ground until it touches the ground. Calculate the average ...
January 15, 2013 by Carol

chemistry
What is the volume occupied by 0.118 mol of helium gas at a pressure of 0.97atm and a temperature of 32 degrees celius? R=0.0821 L atm/mol K
April 18, 2010 by Tracey

Chemistry
5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(g) + B(g) --> 3C(g) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.
May 11, 2012 by Sandra

chemistry
Calculate the heat of formation of SiO4(s), given that the heats of formation of SiO2(s), -910.90 KJ/mol; H2O(l), -285.8 KJ/mol; HF (g), -271.1 KJ/mol.
November 7, 2008 by matt

chem help!!
The following equilibrium concentrations were observed for the Haber process at 127 oC: [NH3] = 3.1 x 10-2 mol L-1 [N2] = 8.5 x 10-1 mol [H2] = 3.1 x 10-3 mol Calculate the value of K at 127 oC for this reaction
May 31, 2011 by xx

PLEASE HELP CHEM!!
5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(G) + B(G) <--> 3C(G) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.
April 21, 2013 by scilover

physics
What is the speed of a communications satellite orbiting the Moon at an altitude of 290 km above the Moons surface? I know that G=6.67e-11 and h=290. I plugged inthese values, 7.35e24 for the mass and 1.738e6 for the radius into v=sqrtGM/R=h but I didn't get the right answer.
January 19, 2011 by joe

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