The mass of 1.63x10^21 silicon atoms is how many grams

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules