A temperature change in a reaction indicates a “( physical change)”
In a redox reaction an electron is lost by the reducing agent
Mass of NaCl = 750 g
mass of water = 1000 kg
Kf = - 1.86 °C
moles of NaCl =

=

= 12.8 moles
molality of NaCl =

=

Δ Tf = Kf * m = -1.86 * 0.01282 = - 0.024 °C