Question

How many molecules are indicated by writing 2 H2O?

A.) 2
B.) 3
C.) 4
D.) 1

Answer 1

A, 2 molcules
H2O is one molecule, it has 3 atoms (two hydrogen and one oxygen)
2 H2O are two water molecules

Answer 2

There are three total molecules in H2O, but the two represents the number of Hyrdogen molecules. So the 2 represents 2 molecules