Chapter 9, Problem 58QAP ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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# Silicon carbide, SIC, is one of the hardest materials known. Surpassed in hardness only by diamond, it is sometimes known commercially as carborundum. Silicon carbide is used primarily as an abrasive for sandpaper and is manufactured by heating common sand (silicon dioxide, SiO 2 ) with carbon in a turn ace.:math> SiO 2 ( s ) + C ( s ) → CO ( g ) + SiC ( s ) at mass of silicon carbide should result when 1.0 kg of pure sand is heated with an excess of carbon?

Interpretation Introduction

Interpretation:

The mass of silicon carbide should be calculated.

Concept Introduction:

The expected or theoretical yield of the product depends on the limiting reactant of the reaction. Limiting reactant is the reactant that limits the mass of product formed in the reaction. The reactant other than limiting reactant is known as excess reactant.

Explanation

The mass of pure sand is 1.0 kg and carbon is present in excess. Thus, SiO2 is a limiting reactant.

The balanced chemical reaction is as follows:

SiO2(s)+3C(s)2CO(g)+SiC(s)

First calculate the number of moles of sand or SiO2 as follows:

n=mM

Molar mass of SiO2 is 60.08 g/mol thus, number of moles will be:

n=1.0 kg(1000 kg1 kg)60

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