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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

A 2-in. piece of chocolate cake with frosting provides 1670 kJ of energy. What is this in dietary Calories (Cal)?

Interpretation Introduction

Interpretation: The conversion of energy in calorie has to be calculated.

Concept Introduction:

Joule: The joule is related directly to the units used for mechanical energy.

Calorie: The calorie is an older energy unit. It is defined as the energy transferred as heat that is required to raise the temperature of 1g of substance by one degree Celsius.

  1Calorie =4.184joules (J).

Explanation

The value of energy in calories is calculated as,

  Conversion of units:Given: 1670 kJ = 1670 ×103JKnown: 1Calorie =4.184joules (J)

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