A compound of silver and oxygen decomposes when heated. given the data table, calculate the empirical formula?

Question

for the compound.

mass of crucible, cover, and compound before heating... 22.89g

mass of crucible, cover, and compound after heating.... 22.70g

mass of crucible and cover.... 20.15g

Answer 1

weight of compound before heating=22.89-20.15=2.74g

weight of compound after heating=22.70-20.15=2.55g

compound loss during heating=2.74-2.55=0.19g

compound lossis oxygen,

compound remain after heating is silver.

reaction equation:

AgxOy + y/2H2--> xAg + yH2O

x=2.55/107.87=0.024 mole Ag

y=0.19/16=0.012 mole O

Divided by smallest mole,

0.024/0.012=2

0.012/0.012=1

So, empirical formula=Ag2O