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

108.43 grams KNO₃

Explanation:

To solve this problem we use the formula:

Where

We solve for b:

Using the given volume of water and its density (aprx. 1 g/mL) we calculate the necessary moles of KNO₃:

Finally we convert KNO₃ moles to grams, using its molecular weight:

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements