EBK CHEMICAL PRINCIPLES IN THE LABORATO
EBK CHEMICAL PRINCIPLES IN THE LABORATO
11th Edition
ISBN: 9780100546066
Author: SLOWINSKI
Publisher: YUZU
Question
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Chapter 14, Problem 1ASA

(a)

Interpretation Introduction

Interpretation: In the given system, Δt for water is to be determined.

Concept introduction:

Calorimetry is a technique used to measure how much heat is produced or absorbed during a chemical reaction. It is used to determine the specific heat of the metal. The expression for heat evolved or absorbed is as follows:

  q=m×S.H.×Δt

Here, m is mass, S.H. is specific heat capacity, and Δt is the temperature change.

(a)

Expert Solution
Check Mark

Answer to Problem 1ASA

  18.8°C

Explanation of Solution

The initial temperature is 23.0°C .

Final temperature is 41.8°C .

Expression for Δt is,

  Δt=tfinaltinitial=41.8°C23.0°C=18.8°C

Thus, Δt for water is 18.8°C .

(b)

Interpretation Introduction

Interpretation: In the given system, Δt for metal is to be determined.

Concept introduction:

Calorimetry is a technique used to measure how much heat is produced or absorbed during a chemical reaction. It is used to determine the specific heat of the metal. The expression for heat evolved or absorbed is as follows:

  q=m×C×Δt

Here, m is mass, C is specific heat capacity, and Δt is the temperature change.

(b)

Expert Solution
Check Mark

Answer to Problem 1ASA

  57.7°C

Explanation of Solution

The initial temperature of metal is 99.5°C .

Final temperature is 41.8°C .

Expression for Δt is,

  Δt=tfinaltinitial=41.8°C99.5°C°C=57.7°C

Thus, Δt for metal is 57.7°C .

(c)

Interpretation Introduction

Interpretation: The amount of heat flowed into the water is to be determined.

Concept introduction:

Calorimetry is a technique used to measure how much heat is produced or absorbed during a chemical reaction. It is used to determine the specific heat of the metal. The expression for heat evolved or absorbed is as follows:

  q=m×S.H.×Δt

Here, m is mass, S.H. is specific heat capacity, and Δt is the temperature change.

(c)

Expert Solution
Check Mark

Answer to Problem 1ASA

  3,907.98 J

Explanation of Solution

Amount of water is 49.73 g

Specific heat of water is 4.18 J/g°C

  Δt for water is 18.8°C .

Now, calculate heat flowing in water as follows:

  q=m×S.H.×Δt=49.73 g×4.18 J/g°C×18.8°C=3,907.98 J

Thus, heat flowed to water is 3,907.98 J .

(d)

Interpretation Introduction

Interpretation: The specific heat of metal is to be determined.

Concept introduction:

Calorimetry is a technique used to measure how much heat is produced or absorbed during a chemical reaction. It is used to determine the specific heat of the metal. The expression for heat evolved or absorbed is as follows:

  q=m×S.H.×Δt

Here, m is mass, S.H. is specific heat capacity, and Δt is the temperature change.

(d)

Expert Solution
Check Mark

Answer to Problem 1ASA

  0.457 J/g°C

Explanation of Solution

Amount of metal is 147.90 g

  Δt for metal is 57.7°C . (Only value is taken not sign)

Heat given by metal is absorbed by water. Thus, heat given by metal is 3,907.98 J .

Now, calculate heat flowing in water as follows:

  qH2O=S.H.H2O×mH2O×ΔtH2O=S.H.m×mm×Δtm=S.H.m×mm×Δtm3,907.98 J=147.90 g×S.H.m×57.7°CS.H.m=3,907.98 J147.90 g×57.7°C=3,907.98 J147.90 g×57.7°C=0.457 J/g°C

Thus, the specific heat of metal is 0.457 J/g°C

(e)

Interpretation Introduction

Interpretation: The specific heat of metal is to be determined.

Concept introduction:

The relation between molecular mass and specific metal is as follows:

  MM25S.H.J/g°C

Here, MM is molecular formula, and S.H is specific heat.

(e)

Expert Solution
Check Mark

Answer to Problem 1ASA

  54.70 g/mol

Explanation of Solution

  S.H.m is 0.457 J/g°C

Substitute values in the above formula

  MM250.45754.70 g/mol

Thus, the approximate molecular formula of metal is 54.70 g/mol .

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Chapter 14 Solutions

EBK CHEMICAL PRINCIPLES IN THE LABORATO

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