Answer
SnF4
Work Step by Step
We have 5.28 g Sn and 3.37 g F. First we need to convert these to moles.
Sn is 118.7 g/mol so 5.28 g is 0.0445 mol
F is 18.998 g/mol so 3.37g is 0.177 g/mol
Then we divide both by the smaller number, 0.0445
0.0445/0.0445 = 1
0.177/0.0445 = 4
The ratio is 1:4 so we have
SnF4