What is the molarity of a solution if you take 12.0 grams of ca(no3)2 and mix it with 0.105 l of water?
1 answer:
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<h2>Answer:</h2>
<em>8.67kJ/mol</em>
<h2>Explanations</h2>The formula for calculating the amount of heat absorbed by the water is given as:
Determine the moles of KI
Since heat is lost, hence the enthalpy change of the solution will be negative that is:
Determine the enthalpy of solution in kJ•mol-1
Hence the enthalpy of solution in kJ•mol-1 for KI is 8.67kJ/mol
Answer:
250J
Explanation:
Given parameters:
Spring constant = 500N/m
Extension = 1m
Unknown:
Elastic potential energy = ?
Solution:
The elastic potential energy of a body is the energy stored within an elastic string.
EPE = k e²
k is the spring constant
e is the extension
Now;
EPE = x 500 x 1² = 250J