Two systems with heat capacities 19.9 j mol-1 k-1 and 28.2 ] mol 1 k-1 respectively interact thermally and come to an equilibrium temperature of 300c. if the initial temperature of system 1 was 450c, what was the initial temperature of system 2 in °c? you may assume that the total energy of the combined systems remains constant

Answer : The initial temperature of system 2 is,

Explanation :

In this problem we assumed that the total energy of the combined systems remains constant.

The mass remains same.

where,

= heat capacity of system 1 = 19.9 J/mole.K

= heat capacity of system 2 = 28.2 J/mole.K

= final temperature of system =

= initial temperature of system 1 =

= initial temperature of system 2 = ?

Now put all the given values in the above formula, we get

Therefore, the initial temperature of system 2 is,

for points guys

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.