Sylvanite is a telluride mineral found in the Transylvania region of Romania. Sylvanite is 6.3% silver and 34.4% gold by mass. How many atoms of gold are present in a 250-kg sample of sylvanite?

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?