Chapter 1, Problem 7RPS

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# A standard U.S. postage stamp is 2.5 cm long and 2.1 cm wide. What is the area of the stamp in square centimeters? In square meters?

Interpretation Introduction

Interpretation: The area of the postage stamp in square centimeters and square meters has to be given.

Concept Introduction:

Area of rectangle: Area = l (length)×b (wide)

Conversion of centimeters to meters:1cm = 0.01 m

Explanation

The area of the postage stamp in square centimeters is calculated as,

Area of the postage stamp in square centimeters:

Given:â€‰lengthÂ =Â 2.5cm,Â wideÂ =Â 2.1Â cm.AreaÂ ofÂ rectangleÂ (stamp)Â =Â lÃ—wÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â =Â 2.5cmâ€‰â€‰Ã—â€‰â€‰2.1Â cmÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â =Â 5.3Â cm2

The obtained area of the postage stamp in square centimeters is 5

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