Calculate the number of moles and the number of grams of the indicated solutes present in each of the following solution samples.

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.

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?