# How many grams of #NaOH# are contained in 200 mL of a 0.400 M solution?

##### 1 Answer

May 26, 2018

Approx.

#### Explanation:

By definition....

And following this definition dimensionally,

And so here, this product gives...

And the associated mass is

This is why chemists and physicists use units in their numerical calculations; not to confuse students, but to alert them when they have ballsed up a question. If the units didn't simplify to