05/07/24

J. R. S. PLEASE HELP
The Standard enthalpies of formation of gaseous propyne (C3H4), propylene (C3H6), and propane (C3H8), were experimentally determined to be +136.1 kJ, +36.1 kJ, and -136.1 kJ respectively.A... more
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05/06/24

Electrochemistry

Write the line diagram for the cell in which the following reaction occurs:2 AgCl (s) + Pb (s) + 2F- (aq) = Ag (s) + PbF2 (s) + 2Cl- (aq)
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05/06/24

Enough of a monoprotic weak acid is dissolved in water to produce a 0.0102 M solution. The pH of the resulting solution is 2.68 . Calculate the for the acid. K_{a}
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05/05/24

C3H4(g)+4O2(g)->3CO2(g)+2H2O(v). a) Calculate the heat of combustion per mole of C3H4 if the standard enthalpy of formation of gaseous propyne is +134.5 kJ/mol (continued in desc)
b) Calculate the heat evolved upon combustion of one kilogram of C3H4.H2O heat of formation: -241.8 kJ/molCO2 heat of formation: -393.5 kJ/molPLEASE USE SIG FIGS!!!!
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05/05/24

At a certain temperature, 0.3811mol of N2 and 1.521 mol of H2 are placed in a 4 L container.

N2 (g) + 3H2 (g) ⇔ 2NH3 (g) At equilibrium, 0.1201 mol of N2 is present. Calculate the equilibrium constant Kc. (please be as detailed as possible, thank you so much)
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05/04/24

Decomposition of liquid benzene to gaseous acetylene: C6H6 (l) -> 3 C2H2 (g). Delta H=630.0 kJ. What is the total energy change (Delta E) of the system if 34.5 g of benzene decomposes at STP?
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05/04/24

Gen Chem 2 ICE Table & Equilibrium Equation
Determine the concentration of C6H5NH3+ in a buffer solution by constructing an ICE table, writing the equilibrium constant expression, and use this information to determine the concentration of... more
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05/03/24

General Chemistry 2
Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 1.41 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) What is the pH of this buffer?
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05/03/24

General Chemistry 2
What is the pH of a buffer made from 0.350 mol of HBrO (Ka = 2.5 × 10⁻⁹) and 0.100 mol of KBrO in 2.0 L of solution?
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05/03/24

General Chemistry 2
What is the pH of a solution of 0.300 M HNO₂ containing 0.250 M NaNO₂? (Ka of HNO₂ is 4.5 × 10⁻⁴)
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05/03/24

Gen Chem 2 Buffer pH
What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.160 mol of NaOH were added?
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05/03/24

Calculate the cell potential, G (J), and the equilibrium constant Keq for the following electrochemical cell and determine the spontaneous reaction direction.
Calculate the cell potential, G (J), and the equilibrium constant Keq for the following electrochemical cell and determine the spontaneous reaction direction.Pb(s) | Pb2+ (1.50 x 10-5 M) ||... more
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05/03/24

read description for question
Part 1. A chemist reacted 12.0 liters of F2 gas with NaCl in the laboratory to form Cl2 gas and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and... more
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05/01/24

This question concerns the ideal gas law.
Blimps hold approximately 4960 m3 of helium. Assume the gas is at 17 degrees C and 1.00 atm.a. What mass of helium is contained in the blimp?b. If the blimp were full of hydrogen instead of helium,... more
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05/01/24

My question concerns the ideal gas law.

A 2.000-L tank is found containing gas at 27.0 degrees C and 23.11 atm.a. Determine the number of moles of gas in the tank.b. If the mass of the gas is found to be 133.0 g, confirm which halogen is... more
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05/01/24

This question concerns collecting a gas over water.

A sample of mercury oxide, HgO, is decomposed by heating from pure mercury metal and oxygen gas. A volume of oxygen equaling 355 mL is collected over water at 18*C and 725 Torr total pressure.... more
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05/01/24

This question concerns the stoichiometry of gases.

Carbon monoxide, CO, reacts with oxygen to produce carbon dioxide. How many liters of oxygen are required to react with 5.0 L of CO and how many liters of CO2 are produced by the reaction?
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04/30/24

Rate law chemistry
Given the reaction C2H4 + 3O2 —> 2CO2 + 2H2O and the rate constant k = 3.408 L/(mol x S), what is the rate of production of CO2 when C2H4 = 0.15 M and O2 = 0.08 M?
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04/30/24

This question concerns the stoichiometry of gases.

Scientists are studying the effect of a synthetic atmosphere on plant growth. The components of the synthetic atmosphere are 80.5 mol percent Ar, 18.0 mol percent O2, and 1.5 mol percent C02.a. If... more
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04/30/24

This question concerns the stochiometry of gases
Carbon monoxide, C0, reacts with oxygen to produce carbon dioxide. How many liters of oxygen are required to react with 5.0 L of C, and how many liters of C02 are produced by the reaction?
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04/30/24

This question concerns the gas laws and pressure
A driver fills his tires to 35 psi gauge on a day when the air is 36*C. Over the next few weeks, the temperature drops to -5 degrees C. Determine the new pressure in the tires. Assume the tire... more
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04/30/24

This question concerns the gas law and pressure.

A SCUBA diver tank contains 12.00 L of air at a gauge pressure of 119.0 bar and a temperature of 22.00 degrees C. a. Determine the number of moles of air in the tank.b. Determine the volume this... more
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04/30/24

Equilibrium pressure of BrCl
For the equilibriumBr2​+Cl2​<−−>2BrClthe equilibrium constant isKp=7.0at4000 K. If the cylinder is charged withBrClat an initial pressure of1.00 atmand the system allowed to come to... more
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04/29/24

This question concerns stoichiometry and the limiting reactant.

On one of the Apollo lunar missions, N2O4 powered the lunar landing module as it ascended from the surface of the moon. During the ascent, 1.200 times 10^3 kg N2H2, 1.000 times 10^3 kg (CH3)2N2H2,... more
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04/29/24

Calculate Kc for the reaction.
Consider the following equilibrium at 295 K:NH_4HS(s)>>NH_3(g)+H_2S(g)The partial pressure of each gas is 0.265 atm. Calculate Kc for thereaction.
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