Determine the molecular weight of H20.

o 18 g

O 18.0 g

O 18.01 g

O 18.016 g

The correct answer is D

18.016 g

Explanation:

Molecular Weight : It is the sum of atomic weights of each atoms present in the compound.

The molecular weught is measured in atomic mass. unit (amu) or simply"u"

This is calculated by using:

Molecular weight = number of atom x atomic mass of the atom

For H2O

Number of H atoms = 2

Number of O atom = 1

Molecular weight of H2O = 2 (mass of H atom) + 1 (mass of O atom)

Molecular weight = 2 (1.00784) + 15.999

= 18.01558 u

= 18.016 u