Write chemical equation for the reactions taking place when : (i) manganese dioxide is heated with aluminium powder. (ii)steam is passed over red hot iron. (iii) magnesium reacts with hot water.
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Answer:
This will require 266.9kJ of heat energy.
Explanation:
To calculate the energy required to raise the temperature of any given substance, here's what you require:
The mass of the material, m
The temperature change that occurs, ΔT
The specific heat capacity of the material, c (which you can look up). This is the amount of heat required to raise 1 gram of that substance by 1°C.
Here is a source of values of c for different substances:
http://www2.ucdsb.on.ca/tiss/stretton/Database/Specific_Heat_Capacity_Table.html
Once you have all that, this is the equation:
Q=m×c×ΔT
(Q is usually used to symbolize that heat required in a case like this.)
For water, the value of c is 4.186Jg°C
So, Q=750×4.186×85=266858J=266.858kJ
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