describe some acidic oxides that can be prepared by the thermal decomposition of nitrates and carbonates

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

What is avogadro’s number, and why is it useful

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