posted by Sweetie .
Sulfer trioxide, SO3, is made industrially in enormous quantities by combining oxygen and sulfer dioxide, SO2. What amount (moles) of SO3 is represented by 1.00 kg of sulfur trioxide? How many molecules? How many sulfer atoms? How many oxygen atoms?
1,000 g SO3 x (1 mole SO3/molar mass SO3)= moles SO3.
You know there are 6.022 x 10^23 molecules in 1 mole of anything.
Since there is 1 atom S in a molecule of SO3, the number of atoms S must be the same as the number of molecules SO3.
Since there are 3 oxygen atoms per molecule of SO3, there must be 3 times the number of atoms O as there are of molecules SO3.