What’s the purpose of adding 10ml of room temperature water after refluxing the reaction?

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule