An atom of potassium has 19 protons and 20 neutrons. what is its mass number?

What is the molecular formula of a hydrocarbon with m+ = 166? (write the formula with no subscripts, e. g. c4h10.) what is the sum of rings and double bonds in this compound?

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.

What is i fracture in the crust called when land move up, down or sideways