Sulfur trioxide, so3, is made industrially in enormous quantities by combining oxygen and sulfur dioxide, so2. what amount (moles) of so3 is represented by 3.00 kg of sulfur trioxide?

The answer is 37.5 moles

The explanation:

1 - when we have the mass of SO3 in Kg so, first we have to convert it to grams:

mass = 3 * 1000 = 3000 g

2 - we need to get the molar mass of SO3:

molar mass of SO3 = 32 + (16*3)

= 80 g/mol

3 - then we can use this formula to get number of moles:

moles = mass / molar mass

= 3000 g / 80 g/mol

= 37.5 moles