Answer
See the answer below.
Work Step by Step
After heating, only tin oxide is left in the crucible.
Number of moles of tin metal:
$(14.710-13.457)\ g\div 118.71\ g/mol=0.01056\ mol$
Number of moles of oxygen atoms:
$(15.048-14.710)\ g\div 15.9994\ g/mol=0.02112\ mol$
Ratio:
$0.02112/0.01056=2.00$
Empirical formula:
$SnO_2$
