a thin circular-disk earning,5.00 cm in diameter is plated with a coating of gold 0.20 mm thick from an Au+3 bath.

a) how many days does it take to deposit the gold on one side of this earring if the current is 0.010 Ampere (d of Au = 19.3 g/cm3)

b) how many days does it take to deposit the gold on both sides of a pair of these earrings

c) if the price of Au is $320 per troy ounce 31.10 grams), what is the total cost of the gold plating?

where R=8.314 J/(mol⋅K), T is the Kelvin temperature, n is the number of moles of electrons transferred in the reaction, and F=96,485 C/mol e−.

At 68.0 ∘C , what is the maximum value of the reaction quotient, Q, needed to produce a non-negative E value for the reaction

SO42−(aq)+4H+(aq)+2Br−(aq)⇌Br2(aq)+SO2(g)+2H2O(l)

In other words, what is Q when E=0 at this temperature?

Express your answer numerically to two significant figures.

What are some of the key characteristics of unknown sample of an aqueous solution containing an ionic compound? Specific questions: 1. Given that the cation is from Group 1A, what is the identity of the group 1A metal ion in your solution? 2. Given that the ionic compound contains either chloride or hydroxide, how can you determine which? (Two pieces of evidence are required and one must be related to solubility rules) 3. What is the concentration of your solution? (Your unknown sample is known to be about 1 M, but you need to determine the concentration to 3 significant figures using titration. You should plan ahead so that you know approximately what volume of your sample you will need in order to use approximately 25 mL of 0.100 M sulfuric acid for the titration). I'm confused as to how I would go about figuring out these things when even actual information.

How does the Al:Si ratio affect the chemistry of the zeolite?

What are nitrogen isotherms, and what information does one obtain from them?

Explain the meaning of the three assumptions for the Michaelis-Menten kinetics. Express each assumption in mathematical terms.

1. Determine ΔG^o for the following reaction:

2 Na(s) + 2 H₂O(l) --> H₂(g) + 2 OH^-(aq) + 2 Na⁺(aq)

2. Calculate K for the oxidation of iron by H⁺:

2 Fe(s) + 6 H⁺(aq) --> 2 Fe³⁺(aq) + 3 H₂(g)

Calculate the P values for which Br2(g) is in a corresponding state to Xe(g) at 328 K and 73.2 bar .

What is the length (in cm) of an edge of a cube of gold (density = 19.3 g/mL) which has a mass of 19.92 kg?

What is the length (in cm) of an edge of a cube of salt (density = 2.165 g/mL) which has a mass of 20.04 kg?

What is the mass (in g) of a cube of lead (density = 11.3 g/mL) with an edge length of 1.89 cm?

consider the following system at equilibrium:
SiF4 (g) + 2H2O + heat 《》SiO2 (g) + 4HF (g)

a. Is this reaction endothermic or exothermic?
b Which direction will the equilibrium shift if HF is added?
c. Which direction will the equilibrium shift if H20 is removed?
d. Which direction will the equilibrium shift if the system is heated?

The Tesla Powerpack lithium ion battery storage system has the following specifications:

Installed Capacity – 50 KW

Storage Capacity – 210 KWh

Output voltage – 480 V

Overall efficiency – 89%

1. How long (in hours) can the Powerpack deliver the rated power?

2. How much heat is generated by the Powerpack in each charge/discharge cycle?

3. What is the output current of the Powerpack (in amps) when operated at the rated power and voltage?

Assume you are performing the calibration step of Experiment 8 and you begin with 20 g of water at 20 oC and 20 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the temperature of the mixed portions of water to be 45 oC. What is the heat capacity of the calorimeter? Assume room temperature is 25 oC.

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 2.56 L/s at 672 K and contains a partial pressure of NO of 13.5 torr .

a.) What total mass of urea is necessary to react completely with the NO formed during 8.2 hours of driving?

Determine the formula weight, number of molecule and number of moles

1). 1.7293 x10^16 Molecules of H2O

2). 5.699 g of BaSO4

Part A

24195Am→23793Np+_____ Express your answer in isotopic notation.

Part B

_____+0−1e→12655Cs Express your answer in isotopic notation.

Part C

23793Np→_____+42He Express your answer in isotopic notation.

Part D

21885At→_____+42He Express your answer in isotopic notation.