BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

Solutions

Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

Microwave ovens are highly efficient, compared to other cooking appliances. A 1100-watt microwave oven, running at full power for 90 seconds, will raise the temperature of 1 cup of water (225 mL) from 20 °C to 67 °C. As a rough measure of the efficiency of the microwave oven, compare its energy consumption with the energy required to raise the water temperature.

Interpretation Introduction

Interpretation: The efficiency of the microwave oven by comparing energy consumption with energy required to raise the water temperature should be determined from the given data.

Concept introduction:

Microwave oven: Conversion of electric energy into microwave energy is the basis of microwave oven. It consumes lesser energy than gas stove, but cost will be higher for microwave oven usage.

%efficiency=energyabsorbedbywaterenergyreleasedbythehotplate

Energyabsorbedbywaterinjoules=massofthewater(g)×ΔT°C×4.18Jg°CEnergyreleasedbyhotplateinjoules=Totalhotplatewattage(watts)×time(s)×[1J/swatt]

Explanation

Given:

Totalhotplatewattage=1100watttime=90sΔT=67°C20°C=47°CVolumeofwater=225ml=225g

The energy absorbed by the water is,

Energyabsorbedbywaterinjoules=massofthewater(g)×ΔT°C×4.18Jg°C=225g×47°C×4.18Jg°C=44

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Each gene is a blueprint that directs the production of one or more of the body's organs. T F

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

What is the difference between the Milky Way and the Milky Way Galaxy?

Horizons: Exploring the Universe (MindTap Course List)