The first step in the production of high purity silicon for semiconductors is represented by this...

The first step in the production of high purity silicon for semiconductors is represented by this equation. SiO2(s) + 2C(s) → Si(s) + 2CO(g) H° = +689.9 kJ

a. Calculate Hf° for SiO2(s). Given: Hf° for CO(g) = –110.5 kJ·mol–1

b. Find Srxn for the production of pure silicon. Given: S° for C(s) = 5.7 J·K–1 ·mol–1 , for CO(g) is 197.6 J·K–1 ·mol–1 , for Si(s) = 18.8 J·K–1 ·mol–1 , and for SiO2(s) = 41.8 J·K–1 ·mol–1

c. Determine G° for the reaction at 25 °C.

d. Find the minimum temperature in °C at which this reaction is spontaneous. Assume that H° and S° do not vary with temperature.

Solutions

Expert Solution

Hope this will be helpful

Page 1

Page 2

Give your feedback

Amanda K answered 1 week ago

Next > < Previous

Related Solutions

1.Describe the two-step process by which extrinsic semiconductors are created by doping impurities into intrinsic semiconductors....

1.Describe the two-step process by which extrinsic semiconductors are created by doping impurities into intrinsic semiconductors. 2.Compare and contrast the two mechanisms of atomic diffusion and comment on which of these occurs more rapidly and why it occurs more rapidly.

Silicon nitride (Si3N4) is made by combining elemental silicon with nitrogen gas at a high temperature....

Silicon nitride (Si3N4) is made by combining elemental silicon with nitrogen gas at a high temperature. a.) How many grams of silicon are needed to react with an excess of nitrogen to prepare 150. grams of silicon nitride? b.) How many grams of nitrogen would need to react? c.) If you determine that 0.950 moles of silicon nitride were formed in this reaction, what would be the percent yield? Give two possible explanations for why the percent yield would be...

Suppose an experiment was conducted to compare the fracture toughness of high-purity steel of some type...

Suppose an experiment was conducted to compare the fracture toughness of high-purity steel of some type with commercial-purity steel of the same type. For 9 high-purity specimens, the sample mean toughness and sample standard deviation of toughness (in some scale) were 1.82 and 0.6, respectively, whereas for 9 commercial-purity specimens, the sample mean and sample standard deviations were 2.43 and 0.82, respectively. Assume the data for both the high- and commercial-purity steels are normally distributed. Does this data suggest that...

An experiment was performed to compare the fracture toughness of high-purity 18 Ni maraging steel with...

An experiment was performed to compare the fracture toughness of high-purity 18 Ni maraging steel with commercial-purity steel of the same type. For m = 34 specimens, the sample average toughness was x = 63.4 for the high-purity steel, whereas for n = 37 specimens of commercial steel y = 57.8. Because the high-purity steel is more expensive, its use for a certain application can be justified only if its fracture toughness exceeds that of commercial-purity steel by more than...

Suppose that 30% of the semiconductors manufactured in a specific FAB has high level of contamination....

Suppose that 30% of the semiconductors manufactured in a specific FAB has high level of contamination. If the semiconductor has high level of contamination, it has 20% chance of failing. If it does not have a high level of contamination, it only has 1% chance of failing. (a) Define the events as follows: C = a randomly selected semiconductor manufactured in a specific FAB has high level of contamination. F = a randomly selected semiconductors manufactured in a specific FAB...

Lean production requires seven steps be taken. Why, in your opinion, should the first step be...

Lean production requires seven steps be taken. Why, in your opinion, should the first step be designing the process flow? Which lean approaches work in both lean manufacturing and lean service operations? Why is value stream mapping such a critical first step in a company’s move toward a lean approach to operations?

A p-n step junction is made in silicon with Na = 1.5x1016 cm-3 and Nd =...

A p-n step junction is made in silicon with Na = 1.5x1016 cm-3 and Nd = 6.5x1016 cm-3. Assume T = 300K. Calculate the following: (a) the built-in potential Vbi (b) the total depletion layer width W and depletion into the n (Wn) and p (Wp) sides at zero bias (c) the maximum electric field at zero bias (d) the maximum electric field at 7V reverse bias (e) Sketch the energy band diagram, charge density distribution, electric field distribution, and...

10. Consider a step pn junction made of silicon. Carrier lifetimes are given as \tau_n =...

10. Consider a step pn junction made of silicon. Carrier lifetimes are given as \tau_n = 10^{-7} sτn=10−7s and \tau_p = 10^{-7} sτp=10−7s. Assume long diode, i.e. long quasi-neutral regions. What must be the doping density ratio, N_A/N_DNA/ND, in order to have 95% of the total current in the depletion region carried by electrons? Answers within 5% error will be considered correct. 11. Consider two ideal pn junctions at T = 300\: KT=300K with exactly the same physical parameters except...

Explain step one and step two for the production cost report

Labco Scientific sells high-purity chemicals to universities, research laboratories, and pharmaceutical companies. The company wants to...

Labco Scientific sells high-purity chemicals to universities, research laboratories, and pharmaceutical companies. The company wants to invest in new equipment that will reduce shipping costs by better matching the size of the completed products with the size of the shipping container. The new equipment is estimated to cost $450,000 to purchase and install. How much must Labco save each year for 3 years in order to justify the investment at an interest rate of 10% per year?

Subjects