Use Ellingham diagram for the following questions: 1. (a) Find the equilibrium o
ID: 983699 • Letter: U
Question
Use Ellingham diagram for the following questions: 1. (a) Find the equilibrium oxygen partial pressure for the oxidation of Cu right arrow Cu^2O, Cr right arrow Cr^2O^3 and Ni right arrow NiO at 600degreeC. Consider metal and oxides exist in pure phases. (b) Rank the metals in terms of their nobility. 2. Calculate the oxygen partial pressure for Cr^2O^3 formation at 600degreeC using the reaction: 4/3Cr + O^2 right arrow 2/30Cr^2O^3 3. Find the equilibrium oxygen partial pressure for gas mixture CO: CO^2 = 106 (Pco +Pco^2 = 1 atm.) at 1000degreeC. Write the steps needed to calculate the oxygen partial pressure.Explanation / Answer
b) metals in terms of their nobility:
In chemistry, the noble metals are metals that are resistant to corrosion and oxidation in moist air
The short list of chemically noble metals (those elements upon which almost all chemists agree) comprises ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, andgold.
The galvanic series (or electropotential series) determines the nobility of metals and semi-metals
Galvanic series (most noble at top)[edit]
The following is the galvanic series for stagnant (that is, low oxygen content) seawater. The order may change in different environments.
Graphite
Palladium
Platinum
Gold
Silver
Titanium
Stainless steel 316 (passive)
Stainless Steel 304 (passive)
Silicon bronze
Stainless Steel 316 (active)
Monel 400
Phosphor bronze
Admiralty brass
Cupronickel
Molybdenum
Red brass
Brass plating
Yellow brass
Naval brass 464
Uranium 8% Mo
Niobium 1% Zr
Tungsten
Tin
Lead
Stainless Steel 304 (active)
Tantalum
Chromium plating
Nickel (passive)
Copper
Nickel (active)
Cast iron
Steel
Indium
Aluminum
Uranium (pure)
Cadmium
Beryllium
Zinc plating (see galvanization)
Magnesium
3) partial pressure
Dalton's law of partial pressures states that the total pressure exerted by a mixture of gases is the sum of partial pressure of each individual gas present.
Each gas is assumed to be an ideal gas.
in a mixture of gases, the percent of each gas in the total volume is the same as the percent of each partial pressure in the total pressure.
From the total pressure of a mixture of gases and its percent composition, we can calculate the partial pressure of the individual gases.
“partial pressure” refers to the pressure that each gas in a gas mixture exerts against its surroundings, such as a sample flask, a diver’s air tank, or the boundary of an atmosphere
You can calculate the pressure of each gas in a mixture if you know how much of it there is, what volume it takes up, and its temperature.
You can then add these partial pressures together to find the total pressure of the gas mixture, or, you can find the total pressure first and then find the partial pressures.
Vgas/VTotal = Pgas/PTotalRelated Questions
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