how many Oxygen atoms are in 3.15 mol of SnO2?

To find the number of oxygen atoms in 3.15 moles of SnO2, we need to determine the formula for SnO2 and the number of oxygen atoms in one mole of the compound.

The formula for SnO2 is:

SnO2

SnO2 contains one oxygen atom per molecule, because the formula shows one oxygen atom for every tin atom.

There are 3.15 moles of SnO2, so there are 3.15 moles of oxygen atoms.

And since there is one oxygen atom per mole of SnO2, there are a total of 3.15 moles * 1 oxygen atom/mole = 3.15 oxygen atoms in 3.15 moles of SnO2.