Question

What mass is associated with a `1/2*mol` quantity of sodium hydroxide?

Answer 1

Well........`"sodium hydroxide"` has a molar mass of `40.0*g*mol^-1`

Explanation:

And thus if we have a `1/2*mol` of `"caustic soda"`, we have a mass of..........

`1/2*cancel(mol)xx40*g*cancel(mol^-1)=??g`

Note the DIMENSIONAL consistency of the answer. We want an answer with units of mass, and the product gives us an answer with units of mass. This is a check on my calculations, and built in detection of possible error on my part in framing the problem......