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The standard potential of the following cell:
Cd (s) / Cd (NO3)2 (aq) // KBr (aq) / AgBr (s) / Ag (s)
Was found to be 0.4731 V at 25°C. The temperature coefficient of the emf of the cell is 1.74 x 10-4 VK-1. Write the cell reaction and calculate ΔG°, ΔS° and ΔH°.
Consider the cell: Zn (s) I ZnCl2 (0.0050 mol kg-1) I Hg2Cl2 (s) I Hg (I)
i) Identify the types of electrodes combined to form this cell.
ii) Write the overall cell reaction.
iii) Apply the Debye-Hückel law to find ZnCl2, and express theNernst equation in terms of activities.
iv) Evaluate Ecell and identify the direction of the spontaneous reaction if a wire is connected between the two electrodes.
{E° Zn2+/Zn = -0.7628 V and E° Hg2Cl2/ Hg, Cl- = -0.2676 V}
A 0.05 M solution of a salt occupying a volume between two platinum electrodes separated by a distance of 1.72 cm and having an area 4.5 cm2 has a resistance of 250 ohms. Calculate the conductivity of the solution.
For a solution of a solution containing 0.3 mol kg-1 NaCl mixed with 0.2 mol kg-1 MgSO4?
i. Calculate the total ionic strength of the solution.
ii. Calculate the mean activity coefficient of MgSO4. (A = -0.509 mol kg-1)
Q1) Compare and contrast each of the following terms. a) acid ionization constant, base ionization constant b) end point, equivalence point
An 8.25 L tire contains 0.529 mol of gas at a temperature of 316 K
What is the pressure (in atm) of the gas in the tire?
Express the pressure to three significant figures and include the appropriate units.
The emission of NO2 by fossil fuel combustion can be prevented by injecting gaseous urea into the combustion mixture. The urea reduces NO (which oxidizes in air to form NO2) according to the following reaction: 2CO(NH2)2(g)+4NO(g)+O2(g)→4N2(g)+2CO2(g)+4H2O(g) Suppose that the exhaust stream of an automobile has a flow rate of 2.32 L/s at 658 K and contains a partial pressure of NO of 10.6 torr .
What total mass of urea is necessary to react completely with the NO formed during 8.4 hours of driving? Express your answer using two significant figures.
Natural way of food preservation has been part of the Filipino cuisine and food
culture, this enables Filipino families to store food for future consumption and for
“flavor enhancement”. However, since these preservation methods are done
naturally (without preservative) the tendency of food spoilage is very high, and this
has been a big concern in Natural Food Preservation. Now as a Filipino student,
what proposition would you suggest in fixing this concern? And Which concept in
General Chemistry II can be best applied to understand this phenomenon?
Maria Christina Falls is a Plantita she makes sure that all her plants are well
hydrated. One hot afternoon Christina noticed that one of her plants seems so dry
and needs to be hydrated, so she decided to water that plant. However, later that
she has noticed that the leaves of the plant she watered was wilted, and the plant
eventually died. Now, what do you think is the cause of the plant death. Look closely
in molecular level to identify and explain the reasons as to why it happens to
Christina’s plant.
By generations Filipinos prefer to use muriatic acid (HCl) to clean their toilet bowls,
this is because by their observation it is said to be that muriatic acid exhibits stronger
action than those of the new ones. Do you agree to this observation? Why and Why
not?
