James chadwick's significance as it applies to the atomic model

Element before carbon on the periodic table

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.