How much heat is absorbed when 100 grams of water boils into a vapor at waters boiling point 100 degrees C?
Water's Enthalpy of Fusion = 334J/g

Water's Enthalpy of Vaporization = 2260 J/g

A.226,000 Joules

B.22,600,000 Joules

C. 33,400 Joules

D. 3,340,000 Joules

E. 754,840 Joules

In numbering carbon atoms in the parent chain of a hydrocarbon, why would you number from right to left, rather than left to right

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.

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.