Even about the food chain is correct?

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Helium decays to form lithium. which equation correctly describes this decay?

How is an endothermic reaction identified