how many grams of oxygen are formed when 500gof dinitrogen monoxide decomposes?

1.write the balanced equation

2.find the number of moles of N2O
3.find the molar ratio
4.if the ratio is 1:1 than the number of moles for N2O and oxygen will of the same value
5.find the mass using n=m/MM
6. rearrage the equation to get m=n*MM
and you will get the mass of oxygen in grams