What is the experimental yield of sodium carbonate? What is the percent yield for sodium carbonate?

Question

Assume that your empty crucible weighs 15.98 g, and the crucible plus the sodium bicarbonate sample weighs 18.56 g. After the first heating, your crucible and contents weighs 17.51 g. After the second heating, your crucible and contents weighs 17.50 g. Answer the following questions based on this information. 

What is the experimental yield of sodium carbonate?

What is the percent yield for sodium carbonate?

Answer 1

The experimental yield is what "actually" happens in the lab.

The experimental yield is the weight of the crucible after the second heating (as much water as possible has evaporated) - original weight crucible. So 17.50g-15.98g=1.52 g (Experimental yield)

To find % yield, we need more information on the reaction (chemical equation) that happened in this lab, including the initial weights of reagents used. Do you have this information?