6.38 mol of ammonium sulfide, (NH4)2S.. have how many moles and mass

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 ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Compare and contrast refraction of light and sound will give brainliest