What is the percent-by-mass concentration of NaCl in a solution that is prepared by adding 30.0 g of NaCl to 90.0 g of water

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.

Building glycogen from glucose molecules is an example of

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.