# Introduction to Chemical Engineering Processes/Chapter 3 Practice Problems/Solutions

## Problem 1

D.

```  (1.06 g/m^3)*(1 m^3/264.17 Gal.) = 4.01E-3 grams
```

## Problem 2

volume of Toluene = 53.199 cm^3

## Problem 3

Important Conversion Factor : 1 ream = 500 sheets

A.

```  (10,000 reams)*(500 sheets/1 ream)*(1 book/250 sheets) = 20,000 books
```
```  (30,000 Lbs. ink)*(1 book/0.2 Lbs. ink) = 150,000 books
```
```  Paper is the limiting resource @ 20,000 books.
```

B.

```  (1-0.04)*(20,000 books) = 19,200 books
```
```  North America : (19,200 books)*(0.15) = 2880 books
South America : (19,200 books)*(0.10) = 1920 books
Europe        : (19,200 books)*(0.20) = 3840 books
Africa        : (19,200 books)*(0.20) = 3840 books
Asia          : (19,200 books)*(0.25) = 4800 books
Australia     : (19,200 books)*(0.10) = 1920 books
```
```  Cost of Printing
(20,000 books)*(\$0.50) = \$10,000
```
```  Shiping Cost
North America : (2880 books)*(\$0.05) = \$144
South America : (1920 books)*(\$0.08) = \$153.6
Europe        : (3840 books)*(\$0.10) = \$384
Africa        : (3840 books)*(\$0.20) = \$768
Asia          : (4800 books)*(\$0.12) = \$576
Australia     : (1920 books)*(\$0.15) = \$288
Total Shiping Cost = \$2,313.6
```
```  Basis : 1 book sell = \$1.00

Total Daily Production Cost : \$10,000 + \$2,313.6 = \$12,313.6
```
```  Daily Max Profit : \$19,000 - \$12,313.6 = \$6,886.4
```

C.

```  Selling 12,314 books/day would return a profit of \$0.40/day
```

D.

```  Pounds of Ink
North America : (2880 books)*(0.02 Lbs ink) = 57.6 Lbs. ink
South America : (1920 books)*(0.02 Lbs ink) = 38.4 Lbs. ink
Europe        : (3840 books)*(0.02 Lbs ink) = 76.8 Lbs. ink
Africa        : (3840 books)*(0.02 Lbs ink) = 76.8 Lbs. ink
Asia          : (4800 books)*(0.02 Lbs ink) = 38.4 Lbs. ink
Australia     : (1920 books)*(0.02 Lbs ink) = 96.0 Lbs. ink
```
```  Sheets of Paper
North America : (2880 books)*(250 sheets) =   720,000 Sheets
South America : (1920 books)*(250 sheets) =   480,000 Sheets
Europe        : (3840 books)*(250 sheets) =   960,000 Sheets
Africa        : (3840 books)*(250 sheets) =   960,000 Sheets
Asia          : (4800 books)*(250 sheets) = 1,200,000 Sheets
Australia     : (1920 books)*(250 sheets) =   480,000 Sheets
```

E.

```  Improve the Profit Margin
-Cheaper paper feed stock
-Recycle defective books for tax incentives
-Use recycle paper feed stock for tax incentives
-Cheaper ink feed stock
-Use enviromentally friendly feed stock for tax incentives
-Reduce number of defective books produced
-Sell the book at higher prices where the market will allow
```