How many atoms of each element are represented in the following:

Question

A.) 3NaCl
B.) H2SO4
C.) 4H2SO4

Answer 1

Subscripts multiply the atom for which it's a subscript.
Coefficients multiply everything that follows.
3NaCl. 3Na and 3Cl
H2SO4 2H 1S 4O
4H2SO4 8H, 4S, 16O