Question

Who would be maybe evolved ored The Is they alchemy finds the 206 KO) del 115.0 of the tree of the drop 12:30 26 The ha capacity of the cam e to the Based on the service off ) Awame the specific heat of thes e is the specificate AD Relry Enter N IBN

Answer 1

Heat lost by the water = ms$\Delta$T

                                       = 115.80*4.18 J/g·°C*(22.30 - 20.66)°C

                                       = 794.59 J lost by the water

Calorimeter is at same temperatures as the water:

Heat lost by Calorimeter = (1.85 J/°C)*(22.30 - 20.66)°C

                                           = 3.034 J lost by the calorimeter

Heat gained by the solute = 794.59 J + 3.034 J

                                             = 797.62 J

moles of KClO₄ = mass/molar mass

                           = 2.06/138.55

                           = 0.01487 moles

0.01487 moles of KClO₄ gains energy ----> 797.62 J

1 mole of KClO₄ gains energy ----> 797.62*1/0.01487

                                                        = + 53639.5 J/mol

                                                        = + 53.64 KJ/mol

$\Delta$H dissolution of KClO₄ = + 53.64 KJ/mol