Code for finding molecular weight

Question

Can anyone help me???

Answer 1

1H20 = 18u = 18 g/mol

Answer 2

Explain better what you need (example).
Finding a molecular weight is easy but got time. You should give a value for each element, in case, the molecular mass.

Example.
H2O ~
H = 1g
O = 16g

1H2O = 18g

H2SO4
H = 1g
S = I don't remember now
..