Chapter 1, Problem 20RPS

### 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 can of soft drink (335 mL) provides 130 Calories. A bottle of mixed berry juice (295 mL) provides 630 kJ. Which provides the greater total energy’? Which provides the greater energy per milliliter?

Interpretation Introduction

Interpretation: The food that provide greater energy and the one which provides greter energy per milliliter has to be identified.

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

As the given two energy units are different, convert calorie into joule or vice-versa.

Greater total energy:

â€‚Â ConversionÂ ofÂ units:Given:630Â kJÂ =Â 280Â Ã—103â€‰JKnown:Â 1â€‰CalorieÂ =â€‰4.184â€‰joulesÂ (J).Whereas,630Â Ã—103â€‰J,=Â 630Â Ã—103â€‰JÃ—1â€‰Calorie.4.184â€‰joulesÂ (J)Â =Â 150.57Â kcal.

The calculated energy in calorie is 150.57Â kcal. Â By comparing two values 130Â cal and 150.57Â kcal, 150.57Â kcal berry juice provides greater energy.

Greater energy per milliliter:

â€‚Â SoftÂ drink:_Given:Â VolumeÂ =Â 335Â ml;Â EnergyÂ =Â 130Â calWhereas,1Â mlÂ provides,=Â 130Â calÃ—1â€‰ml335Â ml=â€‰0

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