What is the molar mass of (nh4)2so4

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

What is the mass of 0.46 mol of mgcl2

Assignment directions: pick one of the following chemists and perform a bit of research on him/her. answer the following questions. alice hamilton             rosalind franklin marie curie             gertrude b. elion ada yonath             henry cavendish robert boyle             antoine lavoisier mario j. molina             svante arrhenius