# A substance consisting only of Na, B and H is 60.80% Na and 28.60% B. What is the empirical formula of the substance?

##### 1 Answer

Oct 7, 2016

#### Explanation:

As is standard with these sorts of problems, we assume a

And then we divide thru each mass by the ATOMIC mass of each constituent to give a molar ratio.

How did I know that there were

And now we divide thru by the smallest molar quantity, i.e.

This is sodium borohydride, a very common laboratory reagent.