Thanks but I actually read reports of sometimes the info not all being included, like in this post. Also for trends and stuff like which is more electronegative, I or Cl, we'd have to know the positions at least.
Thanks CK, I think that sounds good and comprehensive.
I'd memorize a few molecular weights of common molecules as a time saver. They should give you enough info to figure it out but it will save some time if you already know the MW of H2O, CO2, NO2, for example.