Consider the following reaction:
PCl5 (g)⇄ PCl3 (g) + Cl2 (g) ΔH = 87.9 kJ/reaction
For each of the following changes, indicate whether the reaction will proceed towards products, towards reactants, or have no net reaction to reestablish equilibrium.
a. ___________ Temperature is increased
b. ___________ The pressure is increased by decreasing the volume.
c. ___________ The pressure is decreased by removing some PCl 5 (g)
d. ___________ The pressure is increased by adding N2(g)
e. ___________ Cl2(g) is removed
f. ____________ The temperature is increased and the volume of the vessel is increased simultaneously.
In: Chemistry
Humid air is enclosed in a 5.00-liter flask at 40.0°C. The flask is slowly cooled. When the temperature reaches 20.0°C, drops of moisture become visible on the flask wall. Although the pressure in the flask changes when the temperature drops, it remains close enough to 1 atm for the psychrometric chart to provide a close representation of the behavior of the system throughout the process. Use a psychometric chart to determine the relative humidity, absolute humidity, and wet-bulb temperature of the air at 40.0°C. And please explain how you found it!
In: Chemistry
Air is compressed from an initial state of 1 bar and 298.15K to a final state of 5 bar and 295.15K by three different mechanically reversible processes in a closed system: • Heating at constant volume followed by cooling at constant pressure • Isothermal compression • Adiabatic compression followed by cooling at constant volume Show these processes in a PV diagram and calculate the work required, heat transferred, and the changes in internal energy and enthalpy of the air for each process. For air, Cv ig = 20.785 and Cp ig = 29.100 J/mol/K
In: Mechanical Engineering
Consider a galvanic cell based on the following line notation at 295 K:
Fe|Fe3+||Cu2+|Cu
where the standard cell potential is 0.38 V. What will the following changes do to the potential of the cell?
a) Add water to the anode portion of the cell
increase potential
decrease potential
no change in potential
b) Add equal amounts of water to both the anode and cathode portions of the cell
increase potential
decrease potential
no change in potential
c) Increase the mass of the Cu
increase potential
decrease potential
no change in potential
In: Chemistry
When an iron bar of mass m is dropped through a
height difference Δh, its potential energy changes by the amount
mgΔh, where g is the acceleration of gravity, equal to 9.81 m
s-2. Suppose that when the bar hits the ground, all that
energy is converted to heat, increasing the temperature of the bar.
If the specific heat capacity of the material in the bar is
0.444 J K-1 g-1, calculate
the height from which the bar must be dropped to increase the
temperature of the bar by 2.24 °C.
In: Chemistry
A sample of 4.63 mol of xenon is confined at low pressure in a volume at a temperature of 51 °C. Describe quantitatively the effects of each of the following changes on the pressure, the average kinetic energy per molecule in the gas, and the root-mean-square speed.
(a) The temperature is decreased to -66
°C.
(b) The volume is halved.
(c) The amount of xenon is increased to
6.02 mol.
Give each answer as a decimal factor of the form: new value = factor old value. A factor of 1 means no change.
| Change | P | KEavg | urms |
|---|---|---|---|
| (a) | |||
| (b) | |||
| (c) |
In: Chemistry
Transferred-in costs, FIFO method (continuation of 17-33). Refer to the information in Problem 17-33. Suppose that Larsen Company uses the FIFO method instead of the weighted-average method in all of its departments. The only changes to Problem 17-33 under the FIFO method are that total transferred-in costs of beginning work in process on October 1 are $2,881,875 (instead of $2,932,500) and that total transferred-in costs added during October are $7,735,250 (instead of $7,717,500). Using the FIFO process-costing method, do Problem 17-33.
In: Statistics and Probability
Required: Does FedEx sponsor defined benefit pension plans for its employees? Defined contribution plans? Postretirementhealthcare plans? What amount does FedEx report in its balance sheet in 2017 for its U.S. pension plans? For its postretirementhealthcare plans? FedEx reports three actuarial assumptions used in its calculations of the projected benefit obligation. Whatwere those three amounts in 2017? Did reported changes in those assumptions from the previous yearincrease, decrease, or have no effect on the projected benefit obligation
In: Accounting
1. A _________________ _________ causes light rays from a distant source to converge to a _____________ ______________
2. Charging by induction, a charged rod is brought near a neutral conductor: the electrons in the conductor redistribute such that there is a net positive charge away from the rod (T/F)
3. Electrical resistivity doesn’t change when temperature changes (T/F)
4. With a magnetic core, the total magnetic field is increased by a factor of 10^3 to 10^4 relative to the field without a core. It is described by saying that the magnetic materials have a large _______________ _________________
In: Physics
Q. Assume that you are deciding whether to move to Umeå or stay in Stockholm. If you stay you will earn a constant wage wS throughout your career, and if you move you will earn wU throughout your career. Also assume that you live and work forever. Moving costs are equal to M.
a) Derive the condition under which you are indifferent between moving and staying.
b) Explain how changes in moving costs, in the interest rate and in the wage differential (wU–wS) would affect your decision
In: Economics