How many grams of diborane will react with 7.5 mol of O2

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.

For the following, determine the type of reaction and then give products.

How will the emission of an alpha particle affect the atomic number of an atom