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Phosphorus is prepared by heating in the electric furnace a thoroughly mixed mass of calcium phosphate, sand, and charcoal. It may be assumed that in a certain charge the following conditions exist: the amount of silica used is 10% in excess of that theoretically required to combine with the calcium to form the silicate; the charcoal is present in 40% excess of that required to combine, as carbon monoxide, with the oxygen which would accompany all the phosphorus as the pentoxide. (a) Calculate the percentage composition of the original charge. (6) Calculate the number of pounds of phosphorus obtained per 100 lb of charge, assuming that the decomposition of the phosphate iby the silica is 90% * complete and that the reduction of the liberated oxide of phosphorus, by the carbon, is 70% complete6

Phosphorus is prepared by heating in the electric furnace a thoroughly mixed mass of calcium phosphate, sand, and charcoal. It may be assumed that in a certain charge the following conditions exist: the amount of silica used is 10% in excess of that theoretically required to combine with the calcium to form the silicate; the charcoal is present in 40% excess of that required to combine, as carbon monoxide, with the oxygen which would accompany all the phosphorus as the pentoxide. (a) Calculate the percentage composition of the original charge. (6) Calculate the number of pounds of phosphorus obtained per 100 lb of charge, assuming that the decomposition of the phosphate iby the silica is 90% * complete and that the reduction of the liberated oxide of phosphorus, by the carbon, is 70% complete6

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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 Phosphorus is prepared by heating in the electric furnace a thoroughly mixed

mass of calcium phosphate, sand, and charcoal. It may be assumed that in a certain

charge the following conditions exist: the amount of silica used is 10% in excess of

that theoretically required to combine with the calcium to form the silicate; the

charcoal is present in 40% excess of that required to combine, as carbon monoxide,

with the oxygen which would accompany all the phosphorus as the pentoxide.

(a) Calculate the percentage composition of the original charge.

(6) Calculate the number of pounds of phosphorus obtained per 100 lb of charge,

assuming that the decomposition of the phosphate iby the silica is 90%

* complete and that the reduction of the liberated oxide of phosphorus, by

the carbon, is 70% complete6

7. Phosphorus is prepared by heating in the electric furnace a thoroughly mixed mass of calcium phosphate, sand, and charcoal. It may be assumed that in a certain charge the following conditions exist: the amount of silica used is 10% in excess of that theoretically required to combine with the calcium to form the silicate; the charcoal is present in 40% excess of that required to combine, as carbon monoxide, with the oxygen which would accompany all the phosphorus as the pentoxide. (a) Calculate the percentage composition of the original charge. (b) Calculate the number of pounds of phosphorus obtained per 100 lb of charge, assuming that the decomposition of the phosphate by the silica is 90% complete and that the reduction of the liberated oxide of phosphorus, by the carbon, is 70% complete.
Transcribed Image Text:7. Phosphorus is prepared by heating in the electric furnace a thoroughly mixed mass of calcium phosphate, sand, and charcoal. It may be assumed that in a certain charge the following conditions exist: the amount of silica used is 10% in excess of that theoretically required to combine with the calcium to form the silicate; the charcoal is present in 40% excess of that required to combine, as carbon monoxide, with the oxygen which would accompany all the phosphorus as the pentoxide. (a) Calculate the percentage composition of the original charge. (b) Calculate the number of pounds of phosphorus obtained per 100 lb of charge, assuming that the decomposition of the phosphate by the silica is 90% complete and that the reduction of the liberated oxide of phosphorus, by the carbon, is 70% complete.
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