3/4(x-2)=x-1 please answer me

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

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?