Respuesta :
Answer : The reaction is endothermic.
Explanation :
Formula used :
[tex]Q=m\times c\times \Delta T[/tex]
where,
[tex]\Delta T[/tex] = change in temperature = [tex]1.05^oC[/tex]
Q = heat involved in the dissolution of KCl = ?
m = mass = 0.500 + 50.0 = 50.5 g
c = specific heat of resulting solution = [tex]4.18J/g^oC[/tex]
Now put all the given value in the above formula, we get:
[tex]Q=50.5g\times 4.18J/g^oC\times 1.05^oC[/tex]
[tex]Q=+221.64J[/tex]
The heat involved in the dissolution of KCl is positive that means as the change in temperature decreases then the reaction is endothermic and as the change in temperature increases then the reaction is exothermic.
Hence, the reaction is endothermic.
The amount of heat involves in the KCl reaction is +221.644 J. The reaction is an endothermic reaction.
Computation for the heat of reaction
Specific heat can be defined as the amount of heat required by a gram of a substance to raise the temperature of 1 gram of a substance by 1 degree Celsius.
The specific heat (c) can be given as:
[tex]q=mc\Delta T[/tex]
For the given KCl sample:
- The mass of the sample, [tex]m_s=0.5\;\rm g[/tex]
- The mass of water, [tex]m_w=50\;\rm g[/tex]
The total mass of the calorimeter (m) can be given as,
[tex]m=m_s+m_w\\m=0.5+50\;\text g\\m=50.5\;\text g[/tex]
- The specific heat of the solution, [tex]c=4.18\;\rm J/g^\circ C[/tex]
- The change in temperature for the calorimeter, [tex]\Delta T=1.05^\circ \text C[/tex]
Substituting the values for the heat of the calorimeter (q):
[tex]q=50.5\;\times\;4.18\;\times\;1.05\;\text J\\q=221.644\;\text J[/tex]
The amount of heat that evolves in the reaction is +221.644 J. The unit of q is positive, this states that the energy is absorbed by the system, and the reaction is endothermic.
Learn more about specific heat, here:
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