Number of results: 34,508
stoichiometry
first, make sure the equation is balanced,, to determine which is limiting, we calculate the amount of product produced by each given: for 6 mol N2: 6 mol N2 * (2 mol NH3 / 1 mol N2) = 12 mol NH3 for 12 mol H2: 12 mol H2 * (2 mol NH3 / 3 mol H2) = 8 mol NH3 (a) since H2 ...
Wednesday, March 23, 2011 at 11:00pm by Jai
stoichiometry
**i reposted this** first, make sure the equation is balanced,, to determine which is limiting, we calculate the amount of product produced by each given: for 6 mol N2: 6 mol N2 * (2 mol NH3 / 1 mol N2) = 12 mol NH3 for 12 mol H2: 12 mol H2 * (2 mol NH3 / 3 mol H2) = 8 mol NH3...
Wednesday, March 23, 2011 at 10:59pm by Jai
Chemistry
Initially, 1.68 mol of PCl5(g) and 0.36 mol of PCl3(g) are in mixed in a 2.00 l container. It is later found that 1.44 mol of PCl5 are present when the system has reached equillibrium. Calculate the value of the equllibrium. This is what I did: Equation: PCl5(g) <--&...
Sunday, July 19, 2009 at 6:18pm by Lena
physics
The pressure of the gas in the lungs of the diver will be the same as the absolute pressure of the water at this depth of 50.0 meters. This is: P = Po + ρgh = 101325 + 1000• 9.8•50 =591325 Pa = 5.84 atm If the partial pressure due to the oxygen in the gas ...
Friday, June 15, 2012 at 8:53am by Elena
Chemistry
Using data in table below and S °(NH3(g))= 192.5 J·mol-1·K-1, calculate ÄfS° for NH3(g) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205....
Thursday, June 3, 2010 at 4:48am by Darali
general chemistry
Calculate the molar mass that would be obtained from the actual experimental data under the following conditions. The unknown is methyl propyl ether (CH3OC3H7) which has a vapor pressure of 375.2 torr at room temperature, 20C. The volume of the flask is 135 ml, the temperature...
Tuesday, November 22, 2011 at 12:58am by cinderrrr
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...
Tuesday, October 2, 2012 at 9:19pm by Bru
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...
Friday, October 16, 2009 at 1:33pm by Rose
chemistry
What pressure would have to be applied to steam at 325°C to condense the steam to liquid water (ÄH vap = 40.7 kJ/mol)? Responses Dr bob please! Chemistry - GK, Friday, November 28, 2008 at 11:47pm Use the Clausius-Clapeyron Equation to calculate the vapor pressure at ...
Sunday, November 30, 2008 at 10:07pm by Rachelle
Chemistry
When 1 mol of a gas burns at constant pressure, it produces 2424 J of heat and does 6 kJ of work. How do i calculate delta E for this problem? I tried q+w but that didn't work for me. I got the answer wrong.
Friday, October 9, 2009 at 6:49pm by Katherine
Chemistry
A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 2.7 5.2 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 246 kg. Calculate the pressure in pascals exerted by the shelf ...
Saturday, December 1, 2012 at 9:37pm by Courtney
chemistry
A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals exerted by the shelf ...
Sunday, September 30, 2012 at 1:06pm by Matthew
Chemistry
First convert that 18.2 cm to how much pressure was exerted. The pressure of a column of water 18.2 cm high is density x gravity x height = 1.00g/cc x 9.8 m/s^2 x 0.182m = 1.78 kPa and since the height in the buret is too high, that means the pressure on the gas inside is 1.78...
Wednesday, January 23, 2013 at 6:19pm by DrBob222
Chemistry
Calculate the partial pressure of monatomic hydrogen in hydrogen gas at 2000 K and 1 atm pressure. Given: (i) For ½ H2 ï‚® H, ï„Ho298=217,990 J; ï„So298=49.35 J/K. (ii) Assume that the heat capacity of monatomic gas ...
Saturday, March 31, 2012 at 6:18am by Plizzz help me
Chemistry
Using data in table below and S °(NaCl(s))= 72.38 J·mol-1·K-1, calculate ÄfS° for NaCl(s) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) ...
Thursday, May 26, 2011 at 8:37pm by Roxanne
Chemistry
Using data in table below and S °(NaCl(s))= 72.38 J·mol-1·K-1, calculate ÄfS° for NaCl(s) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) ...
Thursday, May 26, 2011 at 8:37pm by Roxanne
Chemistry
1.00 g of sodium is added to a large excess of water under conditions of constant pressure (1.00 atm) and constant temperature (25 °C ). The following reaction occurs: 2Na (s) +2H2O (l)------> 2NaOH (aq) +H2(g) Delta H°rxn =-369 kJ/mol Calculate the heat ...
Sunday, March 18, 2012 at 4:43pm by Riley
Chemistry
Benzene has a vapor pressure of 100.0 Torr at 26°C. A nonvolatile, nonelectrolyte compound was added to 0.309 mol benzene at 26°C 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...
Monday, February 15, 2010 at 7:48pm by Angelica
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?
Thursday, February 17, 2011 at 10:11pm by Paul
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?
Thursday, February 17, 2011 at 1:00pm by Paul
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...
Monday, April 9, 2012 at 8:58pm by Sam
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 ...
Monday, February 13, 2012 at 2:58pm by Hannah
Chemsitry
Starting out with 50 mL of 0.20 M NaHCO3, calculate how many mL of 0.50 M NaOH solution to add to make 100 mL of approximately 0.10 M (total) buffer solution with a pH of 10.35. By adding NaOH, some of the NaHCO3 gets converted to the conjugate Na2CO3. This conjugate acid/base...
Monday, April 2, 2012 at 11:39pm by Cassandra
chem
Write the equation and balance it. Calculate n for H2 and n for O2 and change these to concentration in mols/L. Determine the limiting reagent. Determine how much of the other reagent remains after the reaction. Convert molarities remaining and formed into mols (mol/L x 75 L...
Saturday, November 17, 2007 at 10:03pm by DrBob222
chemistry
Calculate the partial pressure of propane in a mixture that contains equal numbers of moles of propane (C3H8) and butane (C4H10) at 20 °C and 505 mmHg. (R=0.082 L-atm/K mol)
Thursday, May 3, 2012 at 11:28pm by Brandon
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.
Monday, May 2, 2011 at 11:41pm by Ryan
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.
Tuesday, February 15, 2011 at 12:17am by Chelsea
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
Monday, February 8, 2010 at 9:53pm by heather
chemistry - still need help
Never mind that one. I figured it out. But please help me with this one. The vapor pressure of benzene, C6H6, is 60.0 mm Hg at 13.5°C. The molar heat of vaporization of benzene is 30.8 kJ/mol and R = 8.31 10-3 kJ/mol·K. What is the vapor pressure of benzene at 70.0&...
Wednesday, December 5, 2012 at 6:51pm by Sam
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).
Thursday, May 9, 2013 at 9:36am by alex
Chemistry
Calculate DeltaS0 for the formation of 1 mol of HI(g) from its elements given the following information: S0[H2(g)] = 131 J/mol∙K S0[I2(s)] = 116 J/mol∙K S0[HI(g)] = 206 J/mol∙K. A) 82 J/K B) 165 J/K C) 247 J/K D) 329 J/K
Monday, July 30, 2012 at 1:46pm by Taylor
chemistry
a tank contains 2.6 mol of nitrogen and 1.3 mol of oxygen. If 0.65 mol of oxygen were added to the tank, what effect would this have on the pressure in the tank?
Tuesday, March 1, 2011 at 7:38pm by Anonymous
Chemistry
A Gaseous mixture contains 4.08g of oxygen and 2.78g of Nitrogen a)What pressure is exerted by the mixture inside a 100.0ml metal container at 150C. b) what pressure is contributed by the oxygen? (please show steps)
Friday, April 20, 2012 at 11:38am by cc
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 ...
Sunday, February 26, 2012 at 6:47pm by Angel
General Chemistry
Starting out with 50 mL of 0.20 M NaHCO3, calculate how many mL of 0.50 M NaOH solution to add to make 100 mL of approximately 0.10 M (total) buffer solution with a pH of 10.35. By adding NaOH, some of the NaHCO3 gets converted to the conjugate Na2CO3. This conjugate acid/base...
Tuesday, April 3, 2012 at 1:00am by Lucy
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 ...
Thursday, April 8, 2010 at 10:54pm by Stuck
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).
Sunday, December 2, 2012 at 12:27am by Allyx3
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...
Sunday, October 30, 2011 at 8:10pm by Natasha
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.
Monday, October 25, 2010 at 1:52pm by Tammy
Chemistry
E = q+w q = 6020 J/mol x 1 mol = ? w = -pdV. p is 101.325 Look up te density of ice and calculate the volume of a mol at zero C. Then calculate the volume of a mol of water at zero C. The differecne is dV. I found densities ice/H2O here. http://en.wikipedia.org/wiki/Ice
Wednesday, April 11, 2012 at 6:29am by DrBob222
chemistry
Use PV = nRT to calculate moles N2O. Use PV = nRT to calculate moles CH4. Using the coefficients in the balanced equation, determine the limiting reagent. Convert moles reactants, with regard to the limiting reagent, to moles of the products. Then use PV = nRT to calculate ...
Thursday, November 11, 2010 at 11:17pm by DrBob222
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 &...
Thursday, January 6, 2011 at 6:43pm by Anonymous
chemistry
Calculate the partial pressure of propane in a mixture that contains equal numbers of of moles of propane (C3H8) and butane (C4H10) at 20 degrees C and 844 mmHg. (R=0.082 L-atm/K mol)
Tuesday, April 10, 2012 at 10:09pm by Randy
General Chemistry 2
The molar heat of vaporization of benzene is 31kj/mol. Calculate the entropy change for the liquid vapor equilibrium. At 1 atm pressure, benzene boils at 80.1 degrees Celsius.
Sunday, April 10, 2011 at 10:05am by Tiffany
chem
If the total pressure is 752 mm Hg, that is the pressure of the H2 gas + the pressure of the water. So look up the vapor pressure of water at 25 degrees C (at moderate temperatures I remember that the vapor pressure of water is approximately the samae as the T reading in C---...
Sunday, May 11, 2008 at 8:15pm by DrBob222
physics
The ideal gas law: PV = NRT is certainly valid, but this equation simply tells you that temperature, volume and pressure are related. In this problem the temperature is constant, so what you need to know is the pressure. If you know the pressure then the equation will tell you...
Wednesday, November 19, 2008 at 9:38am by Count Iblis
chemistry
Oxygen in the air is O2 like wise nitrogen is N2. mole fraction = n (mole of 1 component) / N (total mole of all components) Oxygen mole = 21 g /(32g/mol)=0.66 mole Nitrogen mole = 78 g / (28g/mol) =2.78 mole Argon mole = 1g / (40g/mol) =0.025 total mole =0.66 + 2.78 + 0.025 =...
Thursday, August 11, 2011 at 6:04am by student
College Chemistry
A Cylinder is filled with 1.20 mol of He(g) at 25 C under ambient pressure of 0.966 atm. The gas in the cylinder is then heated with 1.430 KJ of heat, and the piston is raised by the expanding gas under the constant ambient pressure. Calculate the following after expansion. a...
Saturday, October 16, 2010 at 3:33pm by J Velji
Chem 1000
A Cylinder is filled with 1.20 mol of He(g) at 25 C under ambient pressure of 0.966 atm. The gas in the cylinder is then heated with 1.430 KJ of heat, and the piston is raised by the expanding gas under the constant ambient pressure. Calculate the following after expansion. a...
Saturday, October 16, 2010 at 3:23pm by J Velji
science
calculate the amount of heat evolved in the complete oxidation of 8.17g of Al at 25 degrees C and 1 atm pressure. change in H for Al2O3 is -1676kJ/mol. 4Al(s) + 3O2(g)--> 2Al2O3(s) please giv me the steps to solving this thanx. delta H = -1676 kJ/mol How many mols do ...
Tuesday, February 6, 2007 at 2:38am by michelle
CHEMISTRY
14. Calculate ƒ´S0 for the formation of 1 mol of HI(g) from its elements given the following information: S0[H2(g)] = 131 J/mol∙K S0[I2(s)] = 116 J/mol∙K S0[HI(g)] = 206 J/mol∙K. A) 82 J/K B) 165 J/K C) 247 J/K D) 329 J/K
Wednesday, August 1, 2012 at 7:14pm by MONICA
chemistry - synthesis of aspirin
1 mol acetic anhydride + 1 mol salicylic acid = 1 mol aspirin I don't know the formulas (I could look them up but you probably have them) but the above tells you what you want to know. It's a 1:1 ratio throughout. You will need to calculate the mols salicylic acid and ...
Friday, April 6, 2012 at 4:23pm by DrBob222
chemistry
1.Vapor pressure is the pressure exerted by a vapor when condensation A. < B. = C. > evaporation over its liquid in a closed system. 2.Evaporation is an A. endothermic B. exothermic process, because when a substance evaporates it must A. absorb B. release energy ...
Monday, January 25, 2010 at 11:01pm by bubble
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
Sunday, April 18, 2010 at 3:53pm by Tracey
Intro Chemistry
Given: C2H2(g) +2HF(g) -> C2H4F2(g) Find: pressure in a 10.0L flask when the reaction is complete When 1.0 mol of C2H2 and 5.0 mol pf HF are reacted in a 10.0 L flask, what will be the pressure in the flask at 0 degrees C when the reaction is complete?
Sunday, May 5, 2013 at 12:57pm by Laichun
Chemsitry
A chemist needs to make 50 mL buffer solution with a pH value of 7.25 using the acid/conjugate base pair of KH2PO4 and Na2HPO4 (which has an effective pKa = 6.86). The buffer solution needs to be made so that the total concentration of buffer is 0.10 M (that is, [acid] + [base...
Monday, April 2, 2012 at 11:39pm by Cassandra
chem
a) I found 0.86 atm b)I'm assuming the CO2 vaporizes completely. Won't the partial pressure of the CO2 be the same as in (a)? Dalton's Law tells us that the total pressure is the sum of the partial pressures of each gas and each gas will exert a pressure as if the ...
Saturday, November 17, 2007 at 10:01pm by DrBob222
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...
Sunday, October 30, 2011 at 6:19pm by Jennifer
Chemistry
Divers know that pressure exerted by the water increases about 100kPa with every 10.2 m of deptt. This means that at 10.2 m below the surface, the pressure is 201kPa; at 20.4 m, the pressure is 301kPa; and so forth. Given that the volume of a balloon is 3.5 L at STP and that ...
Tuesday, January 29, 2013 at 10:42am by Jassia
Chemistry
A mixture containing 0.5 mol of H2 (g) and 0.5 mol of I2 (g) was introduced into a 10L container at a temperature of 448 C. At this temperature the equilibrium constant Kp is 50. i. What is the total pressure in the container before the reaction starts and at equilibrium. ii. ...
Wednesday, December 26, 2012 at 7:25pm by Matt
Chemistry
A mixture containing 0.5 mol of H2 (g) and 0.5 mol of I2 (g) was introduced into a 10L container at a temperature of 448 C. At this temperature the equilibrium constant Kp is 50. i. What is the total pressure in the container before the reaction starts and at equilibrium. ii. ...
Wednesday, December 26, 2012 at 7:24pm by Matt
AP Chemistry
This is a regular stoichiometry problem. You can work it as three problems OR you can collapse the three into one problem with a shortcut. Method 1: Three problems. S + O2 ==> SO2. 34 mol S; calculate mols SO2 formed. Then 2SO2 + O2 ==> 2SO3. Use mols SO2 from ...
Wednesday, September 19, 2012 at 8:29pm by DrBob222
chemistry
Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer is: deltaS(sys)=-253.3J/mol*K deltaS(surr)=466.4 J/mol*K...
Friday, March 16, 2012 at 10:52pm by Leila
physics
If a 1-megaton nuclear weapon is exploded at ground level, the peak overpressure (that is, the pressure increase above normal atmo- spheric pressure) will be 0.2 atm at a distance of 6 km. What force due to such an explosion will be exerted on the side of a house with ...
Tuesday, November 15, 2011 at 7:13pm by Marti
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 ...
Sunday, November 26, 2006 at 2:39pm by Luke
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)
Friday, January 18, 2008 at 5:58am by Sue
Physics please help!!
A 73.5 kg person sits on a 3.20 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.74 cm in diameter. Calculate the pressure exerted on the floor by each leg of the chair, assuming the weight is evenly distributed.
Tuesday, March 15, 2011 at 5:34pm by Megan
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 ...
Thursday, March 4, 2010 at 1:17pm by Staci
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 25°C, 1 atm pressure) at the conditions given the density? 1 C2H5OH + 3 O2...
Sunday, October 12, 2008 at 12:08pm by starlight
chem
The solubility of nitrogen in water is 8.21 E-4 mol/L at 0°C when the nitrogen pressure above water is 0.790 atm. Calculate the solubility of nitrogen in water when the partial pressure of nitrogen above water is 9.55 atm at 0°C?
Wednesday, May 8, 2013 at 4:26pm by madd
Chemistry
Calculate the partial pressure of monatomic hydrogen in hydrogen gas at 2000 K and 1 atm pressure. Given: (i) For ½ H2 -> H, DeltaHo298=217,990 J; DeltaSo298=49.35 J/K. (ii) Assume that the heat capacity of monatomic gas to be 3/2R (iii)The heat capacity of H2 ...
Thursday, March 29, 2012 at 8:59am by John
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...
Monday, October 5, 2009 at 4:10pm by Joe
Science
Try some of the following links for information: http://search.yahoo.com/search?fr=mcafee&p=What+pressure+is+exerted+at+the+bottom+of+a+tube+of+mercury+15cm+high%3F+ Sra
Thursday, October 27, 2011 at 9:54am by SraJMcGin
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 ...
Sunday, October 14, 2012 at 8:03pm by Austin
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 ...
Sunday, October 14, 2012 at 6:54pm by sam
chem h
Methanol (CH3OH) is used in the production of many chemicals. methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2H2(g) ==> CH3OH(g) a) How many moles of each reactant are needed to produce 3.60 x 10^2 g CH3OH? b)...
Monday, December 5, 2011 at 11:44pm by Skye
Chemistry
Methanol (CH3OH) is used in the production of many chemicals. methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2H2(g) ==> CH3OH(g) a) How many moles of each reactant are needed to produce 3.60 x 10^2 g CH3OH? b)...
Monday, April 5, 2010 at 2:19pm by Kim
chemistry
If 6.38 g of a polyethylene glycol is dissolved in 7550 ml of water at 300 oK, the solution has an osmotic pressure of 0.171 torr. Calculate the molar mass (g/mol) of the polyethylene glycol.
Thursday, January 28, 2010 at 8:50pm by eng
Help please? Chemistry
At a certain temperature and pressure, 0.20 mol of carbon dioxide has a volume of 3.1 L. A 3.1-L sample of hydrogen at the same temperature and pressure ____. I think it's supposed to be "contains the same number of molecules" but I'm not sure. And there'...
Wednesday, May 27, 2009 at 11:46am by Kit
CHEMISTRY
At ordinary body temperature (37 C) the solubility of N2 in water in contact with air at ordinary atmospheric pressure (1.0 atm) is 0.015 g/l. Air is approximately 78 mol % N2. a)Calculate the number of moles of N_2 dissolved per liter of blood, which is essentially an ...
Tuesday, February 7, 2012 at 12:15am by Jeremy
Chemistry
At ordinary body temperature (37 C) the solubility of N2 in water in contact with air at ordinary atmospheric pressure (1.0 atm) is 0.015 g/l. Air is approximately 78 mol % N2. a)Calculate the number of moles of N_2 dissolved per liter of blood, which is essentially an aqueous...
Monday, February 6, 2012 at 11:34pm by Jeremy
Chemistry
The pressure exerted by a gas in a container depends on? and why?
Sunday, November 25, 2012 at 7:33pm by ashwee
chemistry
At 650 degree C and a pressure of 690mm HG, the 0.927g sample has a volume of 194cm3. How do I calculate the volume at the same temp but at a pressure of 760mm Hg? Also, how do I calculate the volume at the same pressure but at a temp of 0 degree C? Thanks if it is a gas, you ...
Monday, February 26, 2007 at 8:08am by sarah
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. ...
Thursday, May 17, 2012 at 10:31pm by Katie
Chemistry
Oxygen can be produced in the laboratory by the reaction 2 KClO3(s) → 2 KCl(s) + 3 O2(g) . How much potassium chlorate is needed to produce 2.75 L of oxygen, collected over water at 37◦C and 94.9 kPa? The vapor pressure of water at 37◦C is 6.28 ...
Tuesday, November 20, 2012 at 6:56pm by Caitlin
Chemistry
KClO3 decomposes in the presence of MnO2 to form oxygen gas, collected over H2O at 23.0 degrees C and a barometric pressure of 754.2 torr, as described in the experimental description. After the pressure of the oxygen gas is equalized with atmospheric pressure, the mass of ...
Wednesday, July 9, 2008 at 5:40pm by Anonymous
science
STP =standard temperature and pressure: T= 273.15 K p=10⁵Pa μ for hydrogen =2 g/mol= 0.002 kg/mol R=8.31 J/mol•K. m=1g=0.001 kg From pV=mRT/μ V= mRT/μp
Tuesday, January 22, 2013 at 12:07am by Elena
Chemistry
a. Write the balanced equation for this conversion. 2CO + O2 ==> 2CO2 b. How many moles of oxygen gas would be needed to convert 50.0 mol of carbon monoxide to carbon dioxide? 50.0 mol CO x (1 mol O2/2 mol CO) = ? mol CO2 c. What volume of oxygen gas would be needed to...
Tuesday, January 15, 2013 at 5:17pm by DrBob222
CHEM
mass of C in sample = mass of C in CO2 mass of C in sample = (0.8635 g CO2 / 44 g/mol)(1 mol C / 1 mol CO2)(12 g/mol) = 0.2355 g mass of H in sample = mass of H in H2O mass of H in sample = (0.1767 g H2O / 18 g/mol)(2 mol H / 1 mol H2O)(1 g/mol) = 0.0196 g mass of O in sample...
Thursday, March 14, 2013 at 7:07pm by shane
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...
Sunday, December 11, 2011 at 2:38pm by qwert
Chemistry
How many grams of butane must be burned to provide the heat needed to melt a 85.0-g piece of ice (at its melting point) and bring the resulting water to a boil (with no vapourization)? Assume a constant pressure of 1 bar and use the following data: Hfo(H2O(g))=-241.83 kJ/mol, ...
Monday, January 23, 2012 at 11:40pm by David
physics
18g of liquid water is placed in a flexible bag, the air is excluded, and the bag is sealed. It is then placed in a microwave oven where the water is boiled to make steam at 100C. What is the volume of the bag after all the water has boiled? Assume that the pressure inside the...
Thursday, November 19, 2009 at 11:55am by ana
chemistry
Using data in table below and S °(C2H6(g))= 229.5 J·mol-1·K-1, calculate ÄfS° for C2H6(g) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 I am sorry , last ...
Saturday, May 15, 2010 at 9:35pm by write2khin
chemistry
A 2.0 liter balloon at a temperature of 25°C contains 0.1 mol of oxygen and 0.4 mol of nitrogen. What is the partial pressure of nitrogen?
Monday, December 5, 2011 at 2:34pm by Anonymous
CHEM
Please help me, i don't know how to approach this question! All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? a)0.5 mol of (NH4)3PO4 b)0.5 mol of (NH4)2SO4 c)1 mol of NH4Cl d)1 ...
Tuesday, October 20, 2009 at 11:09am by Marrion
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
Thursday, August 2, 2012 at 12:17am by Anonymous
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 ...
Tuesday, November 11, 2008 at 9:46pm by Anna
Chemistry
A gas sample containing only SO3, CH2O and C2H6O2 has the following mass percent composition: 65.1% SO3 and 8.79% CH2O. Calculate the partial pressure (torr) of SO3 if the total pressure of the sample is 4712 torr. Unit conversion K = C + 273 1 atm = 760 torr Molar Mass (g/mol...
Thursday, March 4, 2010 at 7:26am by Luc
Ap Chemistry
at 25 degrees Cliquid A has a vapor pressure of 100.0 torr, while liquid B has a vapor pressure of 200.0 torr. The heat of vaporization of liquid A is 32.0 kJ/mol and that of liquid b is 18.0 kJ/mol. At what celsius temperature will A and B have the same temperature. I haven&#...
Wednesday, January 23, 2008 at 6:26pm by John
chemistry
First get the number of moles of COCl2 and the total pressure before dissociation starts. 5 g is 5/99 mol. That would occupy (5/99)(673/273)22.4 = 2.79 liter at 300C=673 K and 1 atm. Since is is confined to 1.00 l, the pressure is 2.79 atm initially. When a fraction x ...
Monday, October 13, 2008 at 2:08am by drwls
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