Awater molecule is composed of a large oxygen atom bonded to two small hydrogen atoms. which of the following would make the best model of a water molecule?

a. a drawstring bag filled with blue, green, red, and yellow marbles
b. four index cards printed with either an uppercase or lowercase letter
c. two small, plastic balls attached to a larger plastic ball by toothpicks
d. a large, plastic bucket filled with dirt, dead leaves, and rocks

C. Two small, plastic balls attached to a larger plastic ball by toothpicks

Explanation:

One molecule of water has 1 oxygen atom and two atoms of hydrogen. Each hydrogen is attached to the oxygen by a simple bond, they share one pair of electron.

Because oxygen is larger than hydrogen, a manner to represent a single molecule is to have two small plastic balls (representing hydrogen) attached to a larger plastic ball (representing oxygen) by toothpicks (representing the bonds), such as the image below.

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)