Could you help me this calcula

Could you help me this calculation part? 

Mass of empty, dry crucible (g): 0.5g

Mass of crucible with sodium bicarbonate (g): 0.5g

Mass after first heating (g): 0.5g

Mass after second heating (g): Xg

Mass after third heating (if needed) (g): Yg

C a l c u l a t i o n s :
Show calculations and include all units. Circle your final answers, and include them in the data section
as needed.

1. Calculate the mass of sodium bicarbonate sample used:

2. Calculate the theoretical yield of sodium carbonate based on your starting mass of sodium

3. Calculate the mass of sodium carbonate obtained (this is your experimental yield):

4. Calculate the percent yield for sodium carbonate:

Experimental x 100 =

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