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Sliva [168]
3 years ago
9

Given the balanced equation:

Chemistry
1 answer:
Vikki [24]3 years ago
8 0

Answer: Option (3) is the correct answer.

Explanation:

When a more reactive element or atom replaces a less reactive atom then this type of reaction is known as single displacement reaction.

In the given reaction, potassium iodide reacts with fluorine and results in the formation of potassium fluoride and iodine.

Here, fluorine being more reactive displaces iodine from potassium iodide.

Therefore, it is a single replacement or displacement reaction.

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Fog is an example of solution collide suspension
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Calculate the number of kilojoules to warm 125 g of iron from 23.5 °C to 78.0 °C.
insens350 [35]
Given:
Iron, 125 grams T
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.  
 
Number of moles of iron = 125 g/(55.8 g/mol) = 2.24 moles  
<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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