How many moles of mgs2o3 are in 223 g of the compound

1.63 moles since 1 mole is equal to 136.4332 grams

1.73g molecular∛ weight of MgSO3 = 104.3682 g/mol 
181 g / 104.3682 g/mol 
= 1.73 g

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)