Abrine solution of salt flows at a constant rate of 3 l/min into a large tank that initially held 100 l of pure water. the solution inside the tank is kept well stirred and flows out of the tank at a rate of 2 l/min. if the concentration of salt in the brine entering the tank is 0.4 kg/l, determine the mass of salt in the tank after t min. when will the concentration of salt in the tank reach 0.3 kg/l?

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.