Other Chemistry Answers

how do product and reactant favored reactions differ? what is the relation of these terms to the enthalphy change for a reaction?

The reaction between phosphorous,P4(s), and chlorine, Cl2(g), is exothermic and leads to either PCl3(g) or PCl5(g) depending on the stoichiometric amount of Cl2(g) used. Given the following two chemical equations (EQ 1 and EQ 2) and their associated enthalpy changes for the formation of PCl3(g) and PCl5(g);
EQ 1: P4(s) + 6Cl2(g) → 4PCl3(g) = -2439 kJ/mol-rxn
EQ 2: P4(s) + 10Cl2(g) → 4PCl5(g) = -3438 kJ/mol-rxn
EQ 3: PCl5(g) → PCl3(g) + Cl2(g) = ?
a. Calculate the expected enthalpy change for the decomposition of one mole of PCl5(g) shown in equation 3 (EQ 3).
b. Calculate the expected enthalpy change for the decomposition of 10.50 g of PCl5(g) shown in equation 3 (EQ 3).

1. Some PCl5 is pumped into a 500 mL flask. The PCl3 at equilibrium is 1.50 M. What was the initial [PCl5]?
PCl5 <---> PCl3+ Cl2
Keq= 2.14

2. Keq for the reaction 2HI <----> H2 +I2 has a value of 1.85x 10^-2 at 425 degrees celsius. If 0.18 mol of HI is placed in a 2.0 L flask and allowed to come to equilibrium at this temperature. What will the equilibrium of [I2} be?

3. 0.020 mol of each SO2 and O2 and So3 is placed in a 1.0 L flask and allowed to come to equilibrium. The equilibrium of [SO2] is found to be 0.0080M. What is the value of keq for the reaction: 2SO2+O2<----> 2SO3

4. A 3.00 L flask contains 6.00M H2, 6.00M Cl2, 3.00M HCl at equilibrium. An additional 15 mol of HCl is injected into the flask. What is the [Cl2] when equilibrium is re- established?

Part 1: An old supply of nitrogen gas held in a 0.250 m3 tank inside a hospital storage room exerts a pressure of 1.11 atm at 303 K. Calculate the density of the nitrogen gas in units of (g/L).

Part 2: Refer to Part 1. For waste disposal, the gas is moved to a 22.0 L container, and cooled to a temperature at which the gas pressure is 8.60 x 103 mm Hg. Calculate the final temperature of the gas in absolute Kelvin.

What is the name of the reagent used to determine the end point of a titrimetric analysis?

chloroform is a common liquid used in labs. it vaporizes readily. if the pressure of the cholorform vapor in a flask is 195mm Hg. at 25 degrees Celsius and the density of the vapor is 1.25g/L, whats the color mass of choloform?

a sample of gas occupies 135ml at 22.5 degrees celcius the pressure is 165mm Hg. whats the pressure of the gas sample when its placed in a 252ml flask at a temperature of 0 degrees celcius

What is the wavelength of a microwave having a frequency of 7.74 x 10^6 hz?

Which of the following are signs that a chemical change may have occurred?

formation of a precipitate

release of energy

change in size

formation of condensation

What is the formula to get the steam pressure and steam temperature?