Answer: 1.06 moles
Explanation: To determine the number of moles of a compound present in a given mass, we can use the formula:
moles = mass / molar mass
where molar mass is the mass of one mole of the compound and is measured in g/mol.
The molar mass of sulfur dioxide (SO2) is 64.06 g/mol.
So to find the number of moles of SO2 present in 68 grams, we can plug in the values into the formula:
moles = mass / molar mass
moles = 68 g / 64.06 g/mol
moles = 1.06 moles
Therefore, there are 1.06 moles of SO2 present in 68 grams of this compound.