A compound X contains the elements carbon, hydrogen, and oxygen. After 35 g of X were burned in pure oxygen,…

A compound X contains the elements carbon, hydrogen, and oxygen. After 35 g of X were burned in pure oxygen, 59 g of combustion products containing CO2 and H2O were isolated. A follow-up analysis showed that the combustion products contained 37 g of oxygen. What is the mass of oxygen in 30 g of X?