Does anyone know how to do this? I’m so confused

An example of technology is the a. addition of a side group to an organic molecule during synthesis. b. use of a new antibiotic to fight an infection. c. measurement of iron concentration in a water sample. d. study of atomic fusion reactions

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

Which of the following units is not an official si unit? mole liter kilogram ampere