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ira [324]
3 years ago
7

If the temperature changes in a chemical reaction, what has occurred?

Chemistry
1 answer:
ch4aika [34]3 years ago
8 0
A reaction has happened
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Calculate the number of kilojoules to warm 125 g of iron from 23.5 °C to 78.0 °C.
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1 = 23.5 degrees Celsius, T2 = 78 degrees Celsius.  

Required:
Heat produced in kilojoules  

Solution:
The molar mass of iron is 55.8 grams per mole. SO we need to change the given mass of iron into moles.  
 
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<span>
Q (heat) = nRT = nR(T2 = T1)</span>
Q (heat) = 2.24 moles (8.314 Joules per mol degrees Celsius) (78.0 degrees Celsius – 23.5 degrees Celsius)
<u>Q (heat) = 1014.97 Joules or 1.015 kilojoules</u> <span>This is the amount of heat produced in warming 125 g f iron.</span>
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