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The Pilling-Bedworth ratios are calculated below using a basis of 100.0 g of metal and the following equation: P.B. ratio=[volume of oxide produced by oxidation]/[volume of metal consumed by oxidation] 1. Tungsten oxidation is express as W+3/202→WO3. Density of W and WO3 is 19.35 [g/cm³] and 12.11 [g/cm³], respectively. Mass of W and O is 183.84 g/mol and 16.00 g/mol. 1-a: Calculate the volume, Vw of 100 g tungsten. Vw = [___] cm³ (*Show up to the 2nd decimal place.) 1-b: Calculate the mass of WO3, mw03 when 100 g of tungsten is oxidized. mwo3 g (*Show up to the 1st decimal place.) A 1-c: Calculate the volume, Vwo3 of mwo3 tungsten oxide. Vwo3 = [] cm³ (*Show up to the 2nd decimal place.) A/ 1-d: Calculate the oxide-to-metal volume (Pilling-Bedworth) ratio for tungsten. P.B. ratio = [___]) (*Show up to the 2nd decimal place.) A 2. Based on the result from above calculation, what will happen to tungsten oxide? a: The oxide film is too thin and will most likely break down. b: The oxide film chips off and offers no protection. c: The oxide film is passivating and offers protection from surface oxidation.

The Pilling-Bedworth ratios are calculated below using a basis of 100.0 g of metal and the following equation: P.B. ratio=[volume of oxide produced by oxidation]/[volume of metal consumed by oxidation] 1. Tungsten oxidation is express as W+3/202→WO3. Density of W and WO3 is 19.35 [g/cm³] and 12.11 [g/cm³], respectively. Mass of W and O is 183.84 g/mol and 16.00 g/mol. 1-a: Calculate the volume, Vw of 100 g tungsten. Vw = [___] cm³ (*Show up to the 2nd decimal place.) 1-b: Calculate the mass of WO3, mw03 when 100 g of tungsten is oxidized. mwo3 g (*Show up to the 1st decimal place.) A 1-c: Calculate the volume, Vwo3 of mwo3 tungsten oxide. Vwo3 = [] cm³ (*Show up to the 2nd decimal place.) A/ 1-d: Calculate the oxide-to-metal volume (Pilling-Bedworth) ratio for tungsten. P.B. ratio = [___]) (*Show up to the 2nd decimal place.) A 2. Based on the result from above calculation, what will happen to tungsten oxide? a: The oxide film is too thin and will most likely break down. b: The oxide film chips off and offers no protection. c: The oxide film is passivating and offers protection from surface oxidation.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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The Pilling-Bedworth ratios are calculated below using a basis of 100.0 g of metal and the following equation: P.B. ratio=[volume of oxide produced by oxidation]/[volume of metal consumed by oxidation] 1. Tungsten oxidation is express as W+3/202→WO3. Density of W and WO3 is 19.35 [g/cm³] and 12.11 [g/cm³], respectively. Mass of W and O is 183.84 g/mol and 16.00 g/mol. 1-a: Calculate the volume, Vw of 100 g tungsten. Vw = [___] cm³ (*Show up to the 2nd decimal place.) 1-b: Calculate the mass of WO3, mw03 when 100 g of tungsten is oxidized. mwo3 g (*Show up to the 1st decimal place.) A 1-c: Calculate the volume, Vwo3 of mwo3 tungsten oxide. Vwo3 = [] cm³ (*Show up to the 2nd decimal place.) A/ 1-d: Calculate the oxide-to-metal volume (Pilling-Bedworth) ratio for tungsten. P.B. ratio = [___]) (*Show up to the 2nd decimal place.) A 2. Based on the result from above calculation, what will happen to tungsten oxide? a: The oxide film is too thin and will most likely break down. b: The oxide film chips off and offers no protection. c: The oxide film is passivating and offers protection from surface oxidation.
Transcribed Image Text:The Pilling-Bedworth ratios are calculated below using a basis of 100.0 g of metal and the following equation: P.B. ratio=[volume of oxide produced by oxidation]/[volume of metal consumed by oxidation] 1. Tungsten oxidation is express as W+3/202→WO3. Density of W and WO3 is 19.35 [g/cm³] and 12.11 [g/cm³], respectively. Mass of W and O is 183.84 g/mol and 16.00 g/mol. 1-a: Calculate the volume, Vw of 100 g tungsten. Vw = [___] cm³ (*Show up to the 2nd decimal place.) 1-b: Calculate the mass of WO3, mw03 when 100 g of tungsten is oxidized. mwo3 g (*Show up to the 1st decimal place.) A 1-c: Calculate the volume, Vwo3 of mwo3 tungsten oxide. Vwo3 = [] cm³ (*Show up to the 2nd decimal place.) A/ 1-d: Calculate the oxide-to-metal volume (Pilling-Bedworth) ratio for tungsten. P.B. ratio = [___]) (*Show up to the 2nd decimal place.) A 2. Based on the result from above calculation, what will happen to tungsten oxide? a: The oxide film is too thin and will most likely break down. b: The oxide film chips off and offers no protection. c: The oxide film is passivating and offers protection from surface oxidation.
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