Iodine is 80% 1271, 17% 1261, and 3% 1281. Calculate the average atomic mass of iodine.

r just means there's a number of carbon in teh chain. for example rcooh means that after x number of carbon, the chain ends with cooh.

explanation:

fdvwsa gfwsargebgeebbfwfwffw gwf   vgwgw gw f gwgw fgw v v dsv dwfff

answerambulatory;