Is the final temperature of a solution affected by the order of mixing components?
Temperature is a so-called state function:


  In thermodynamics, a state function or function of state is a function defined for a system relating several state variables or state quantities that depends only on the current equilibrium state of the system. State functions do not depend on the path by which the system arrived at its present state. A state function describes the equilibrium state of a system.


The final temperature of your system does not depend on how the system got there (order of mixing, for example).