Respuesta :
Answer : The amount of heat evolved by a reaction is, 4.81 kJ
Explanation :
Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water
[tex]q=[q_1+q_2][/tex]
[tex]q=[c_1\times \Delta T+m_2\times c_2\times \Delta T][/tex]
where,
q = heat released by the reaction
[tex]q_1[/tex] = heat absorbed by the calorimeter
[tex]q_2[/tex] = heat absorbed by the water
[tex]c_1[/tex] = specific heat of calorimeter = [tex]783J/^oC[/tex]
[tex]c_2[/tex] = specific heat of water = [tex]4.184J/g^oC[/tex]
[tex]m_2[/tex] = mass of water = 254 g
[tex]\Delta T[/tex] = change in temperature = [tex]T_2-T_1=(23.73-26.01)=-2.28^oC[/tex]
Now put all the given values in the above formula, we get:
[tex]q=[(783J/^oC\times -2.28^oC)+(254g\times 4.184J/g^oC\times -2.28^oC)][/tex]
[tex]q=-4208.28J=-4.81kJ[/tex]
Therefore, the amount of heat evolved by a reaction is, 4.81 kJ
