Parr-instrument 6755 Manual do Utilizador descarregar pdf (Página 27)

Calculations

6755

www.parrinst.com

Figure 4

Endothermic Reaction

Example - Endothermic Reaction

Problem: Determine the heat of solution of solid

potassium nitrate, KNO

when dissolved in

water.

KNO

0.7180 gram

Distilled water

100.00 grams

Corrected temperature rise

∆T

= -0.508 °C (from Figure 3)

T(0.63R) = 25.400 °C

Energy equivalent

e = 121.46 cal/°C

Energy evolved

Q =

(∆T

) (e)

= (-0.508) (121.46)

= -61.70 calories

Enthalpy change

= -34.99 cal/g @ 24.885 °C

Or, multiplying by the molecular weight of KNO3

= (85.94) (101.10)

= 8.69 Kcal/mole @ 25.400 °C

0.7180g solid KNO

dissolved in

100.00g of distilled water

Temperature at

time of mixing

25.714 °C

R = ∆T

-0.508 °C

0.63R -0.320 °C

25.720 °C

T(0.63R) = T

+ 0.63R 25.400 °C

= T

+ R 25.212 °C

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 51 52

Operating Instruction Manual 1
Table of Contents 2
PREFACE 3
Explanation of Symbols 4
Installation 6
Quick Start 8
Notes 9
Operation 10
Menu Descriptions 14
Calculations 24
CHAPTER 6 28
Memory Management 29
Accessory Connections 30
Maintenance 40
Troubleshooting 41
Technical Service 42
Parts Lists 43
Drawings 44
Default Settings 50
Revision 07/08/13 52

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