Anyone know what the answer is?

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.

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

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?