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3
45 Diagram 11 shows the energy level diagram for the reaction between 50 cm of 0.2
-3
mol dm copper (II) nitrate solution and excess metal T.
-3
-1 o -1
[Specific heat capacity of solution = 4.2 J g C , density of solution = 1gcm ]

Rajah 11 menunjukkan gambar rajah aras tenaga bagi tindak balas antara 50 cm 3
-3
larutan kuprum (II) nitrat 0.2 mol dm dengan logam T berlebihan.
C , ketumpatan larutan = 1g cm ]
[Muatan haba tentu larutan = 4.2 J g -1 o -1 -3

Diagram 11 / Rajah 11

What is the temperature change in the reaction?
Apakah perubahan suhu bagi tindak balas tersebut?

0
0
A 4.5 C C 8.6 C

0
0
B 7.5 C D 10.5 C

-3
3
46 When excess zinc powder is added to 25 cm of 0.2 mol dm copper(II) sulphate
0
0
solution, the temperature increases from 30 C to 40 C. What is the heat of
displacement of copper?
-1o -l
-3
[Specific heat capacity of a solution :4.2 Jg C , density of solution: 1g cm ]

3
Apabila serbuk zink berlebihan ditambah kepada 25 cm larutan kuprum(II) sulfat 0.2
0
0
-3
mol dm , suhu meningkat daripada 30 C kepada 40 C. Berapakah haba penyesaran
bagi kuprum?
-3
-1o
-l
[Muatan haba tentu larutan: :4.2 Jg C , ketumpatan larutan: l g cm ]

-1
A -21 kJ mol C -210 kJ mol -1

-1
-1
B -42 kJ mol D -420 kJ mol

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