What is the name of PbS2

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.

Classify this reaction: 2al+n2-> aln.

How many moles are contained in 5.6 l of h2 at stp