Spherical, microporous silica particles used in chromatography have a density of 2.20 g/mL, a diameter of 10.0 mm, and a measured surface area of 300 m2/g. (a) The volume of a spherical particle is 43 pr3, where r is the radius. The mass of the sphere is volume X density (= mL X g/mL). How many particles are in 1.00 g of silica? (b) The surface area of a sphere is 4pr2. Calculate the surface area of 1.00 g of solid, spherical silica particles. (c) By comparing the calculated and measured surface areas, what can you say about the porosity of the particles?
Spherical, microporous silica particles used in chromatography have a density of 2.20 g/mL, a diameter of 10.0 mm, and a measured surface area of 300 m2/g. (a) The volume of a spherical particle is 43 pr3, where r is the radius. The mass of the sphere is volume X density (= mL X g/mL). How many particles are in 1.00 g of silica? (b) The surface area of a sphere is 4pr2. Calculate the surface area of 1.00 g of solid, spherical silica particles. (c) By comparing the calculated and measured surface areas, what can you say about the porosity of the particles?
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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Spherical, microporous silica particles used in chromatography have a density of 2.20 g/mL, a diameter of 10.0 mm, and a measured surface area of 300 m2/g. (a) The volume of a spherical particle is 43 pr3, where r is the radius. The mass of the sphere is volume X density (= mL X g/mL). How many particles are in 1.00 g of silica? (b) The surface area of a sphere is 4pr2. Calculate the surface area of 1.00 g of solid, spherical silica particles. (c) By comparing the calculated and measured surface areas, what can you say about the porosity of the particles?
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