Answer:
the answers are either a or d
Explanation:
Answer:

Explanation:
The formula for molality is:

There are 0.210 moles of KBr and 0.075 kilograms of pure water.

Substitute the values into the formula.

Divide.

The molality is <u>2.8 moles per kilogram</u>
C; The Valence electrons spend more time around the atom of F
I believe you just look at your periodic table for this value. I don't think there is any math involved.
Therefore one mole of Mg = 24.305g.
Answer:
physical change because even though gas formation was observed the water was undergoing a state change which means that it's original properties are preserved