What is a solvent? A. The substance that is dissolved in another substance B. The mixture of one substance floating around in another C. The substance that dissolves another substance D. The mixture of one substance dissolved in another

The substance that dissolves the other is called solvent.

Explanation:

Example:  Brine    (salt dissolved in Water).

The substance that dissolves another substance

Explanation:

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)