A chemist found that 4.69 g of sulfur combined with fluorine to produce 15.81 g of gas. What is the empirical formula of the gas?

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.