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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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In the “Chemistry in Focus” segment Firewalking: Magic or Science?, it is claimed that one reason people can walk on hot coals is that human tissue is mainly composed of water. Because of this, a large amount of heat must be transferred from the coals to change the temperature of the feet significantly. How much heat must be transferred to 100.0 g of water to change its temperature by 35 °C?

Interpretation Introduction

Interpretation:

The amount of heat transferred to 100.0 g of water to change its temperature by 35 °C should be calculated.

Concept Introduction:

4.184 J of heat is needed to change the temperature of each gram of water by 1 °C and it is specific heat of water.

Thus, formula used for calculate energy in joules is Q=mcΔT

Where, Q = heat

m = mass of water

c = specific heat capacity of water ( 4.184 Jg°C )

ΔT = change in temperature.

Explanation

It is known that it takes, 4.184 J of energy to change the temperature of each gram of water by 1 °C.

Therefore, multiply 4.184 J by the mass of water and temperature change.

ΔT (Temperature change) = 35 °C

So,

Heat = 4

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