4. For the reaction represented by the equation 3Fe + 4H,0 - Fe,, + 4H,, how many moles of iron(III) oxid are produced from 500 g of iron in an excess of H. O?
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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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