What is the volume of pure sulfur if its mass is a 130 g and the density is 2.07 g/mL

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

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.

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