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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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Some properties of potassium metal are summarized in the following table:

rmal melting point

:math> 63 . ° C

rmal boiling point

:math> 765 . ° C

lar heat of fusion

:math> 2 . 334 kJ / mol

lar heat of vaporization

:math> 79 . 87 kJ / mol

ecific heat of the solid

:math> 0. 75 J / ° C

Calculate the quantity of heat required to heat 5 .00  g of potassium from 25 . ° C to 45 . ° C .

Calculate the quantity of heat required to melt 1 . 35 moles of potassium at its normal melting point.

Calculate the quantity of heat required to vaporize 2 . 25 g of potassium at its normal boiling point.

Interpretation Introduction

(a)

Interpretation:

Quantity of heat required to heat 5.0g of potassium from 25.30C to 45.20C must be calculated.

Concept Introduction:

To increase the temperature of a solid we need to supply heat energy. Specific heat plays crucial role in increase of temperature of a substance.

Explanation

The heat energy (H) required to increase temperature of a substance depends on mass of the substance (m), specific heat of the substance(s) and temperature rise (t). Thus we can write

H=m×s×t

Putting all the values we get

H=5g×0

Interpretation Introduction

(b)

Interpretation:

How much heat energy will be required to melt 1.35 mol of potassium at its normal melting point must be calculated?

Concept Introduction:

Melting point is the temperature at which a solid starts melting to liquid and until all the solid is not melted temperature remains same.

Interpretation Introduction

(c)

Interpretation:

How much heat energy will be required to vaporize 2.25g of potassium at its normal boiling point must be calculated?

Concept Introduction:

Boiling point is the temperature at which a liquid starts boiling to vapor and until all the liquid is not boiled off temperature remains same.

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