Determine la cantidad de masa en moles de H3PO4 necesaria para preparar 250 ml de una solución acuosa (con H2O) 0,015M.

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.

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?

How do dying stars contribute to the formation of planets