Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN: 9781337398909
Author: Lawrence S. Brown, Tom Holme
Publisher: Cengage Learning
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Chapter 4, Problem 4.47PAE

4.47 Silicon carbide is, an abrasive used in the manufacture of grinding wheels. A company is investigating whether they can be more efficient in the construction of such wheels by making their own SiC via the reaction

   SiO 2 +  3 C   SiC  +  2 CO

(a) If this reaction consistently has a yield of 85%, what is the minimum amount of both silicon dioxide and carbon needed to produce 3400 kg of SiC for the manufacture of cutting wheels? (b) The silicon dioxide is to he obtained from sand and the carbon is derived from coal. If the available sand is 95% SiO2 by weight and the coal is 73% C by weight, what mass of coal is needed for each metric ton of sand used?

a.

Expert Solution
Check Mark
Interpretation Introduction

To determine: The minimum amount of both silicon dioxide and carbon needed to produce 3400 kg of SiC for the manufacture of cutting wheels.

Explanation of Solution

Step 1: Balance Reaction

Reaction is already balanced

Step 2: Change all amounts to mol

molSiC=massMolecularWeight=340040.09= 84.809 kmol

Step 3: Relate stoichiometry

Ratio=1:1

1 mol SiO2=1 mol SiCmol SiO2=84.809 kmol

Now, for carbon:

Ratio=1:3

1 molSiO2=3 molCmolC=3×(84.809 kmol) = 254.427kmolC

Step 4: Calculate mass

For SiO2

massSiO2=mol×Molecular Weight SiO2massSiO2=(84.809kmol)×(60.0843 kg/kmol)massSiO2= 5095.689kgSiO2

Now, for carbon

massC=mol×Molecular Weight SiO2massC=(254.427 kmol)×(12.0 kg/kmol)massC=3052.8kgC

Step 5: Correct for actual yield

actualmassSiO2=(5095.689kg SiO2)×( 85% 100%)actualmassSiO2=4330.75 kg

actualmass C=(3052.8 kgC)×( 85 % 100 %)actualmass C=2594.88 kg

b.

Expert Solution
Check Mark
Interpretation Introduction

To determine:

Mass of coal needed for each metric ton of sand used.

Explanation of Solution

Now, relate new amounts.

Step 1: Relate 1 metric ton of sand:

massSand=1ton=1000kgmassSiO2=(1000kg)×( 95 100)massSiO2=950kg

Step 2: Use Ratio between reactants:

Ratio=3×Molecular Weight C1×Molecular Weight SiO2=3×(12)60.08=0.5992massC=(950kg)×(0.5992)=569.24kgC

Step 3:Calculate mass of coal

massCoal=569.24kgC1×100kgCoal73kgCmassCoal=779.78kg

Conclusion

a. massC=2594.88kg ; massSiO2=4330.75 kg

b. massCoal=779.78kgper ton

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Chapter 4 Solutions

Chemistry for Engineering Students

Ch. 4 - 4.4 Automobile exhaust often contains traces of...Ch. 4 - 4.5 Methane, ethane, and propane are also...Ch. 4 - 4.6 Use the web to research prices of gasoline at...Ch. 4 - For the following reactions, write the ratios that...Ch. 4 - 4.8 In an experiment carried out at very low...Ch. 4 - 4.9 Sulfur, S8, combines with oxygen at elevated...Ch. 4 - 4.10 How many moles of oxygen can be obtained by...Ch. 4 - 4.11 MTBE, C5H12O, is one of the additives that...Ch. 4 - 4.12 In petroleum refining, hydrocarbons are often...Ch. 4 - 4.13 For the following reactions, determine the...Ch. 4 - 4.14 The combustion of liquid chloroethylene,...Ch. 4 - 4.15 What mass of the unknown compound is formed...Ch. 4 - 4.16 Many metals react with halogens to give metal...Ch. 4 - 4.17 Phosgene is a highly toxic gas that has been...Ch. 4 - Prob. 4.18PAECh. 4 - 4.19 How many metric tons of carbon are required...Ch. 4 - 4.20 Assuming a charcoal briquette is composed...Ch. 4 - 4.21 Ammonium nitrate, NH4NO3, will decompose...Ch. 4 - 4.22 Generally, an excess of O2 is needed for the...Ch. 4 - 4.23 In the reaction of arsenic with bromine,...Ch. 4 - 4.24 Ammonia gas can be prepared by the reaction...Ch. 4 - 4.25 When octane is combusted with inadequate...Ch. 4 - 4.26 The equation for one of the reactions in the...Ch. 4 - 4.27 Copper reacts with sulfuric acid according to...Ch. 4 - 4.28 One of the steps in the manufacture of nitric...Ch. 4 - 4.29 When Al(OH)3 reacts with sulfuric acid, the...Ch. 4 - 4.30 Copper reacts with nitric acid via the...Ch. 4 - 4.31 How much HNO3 can be formed in the following...Ch. 4 - 4.32 Hydrogen and oxygen are reacted and the water...Ch. 4 - 4.33 Silicon carbide, an abrasive, is made by the...Ch. 4 - Prob. 4.34PAECh. 4 - Prob. 4.35PAECh. 4 - 4.36 Sometimes students in chemistry labs...Ch. 4 - 4.37 The theoretical yield and the actual yield...Ch. 4 - 4.38 A reaction that produced 4.8 mg of taxol, an...Ch. 4 - Methanol, CH3OH, is used in racing cars because it...Ch. 4 - 4.40 When iron and steam react at high...Ch. 4 - 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