Question

I know this is the Math section, but no one will help me in the Chemistry section.. Help would be greatly appreciated.. I will give a medal. :)

Answer 1

http://gyazo.com/bdce8d1c96fb4683a30f2174d591fe0f

Answer 2

Take your atomic mass and abundance which is in percent change to decimal then multiply the two and add all three together being careful of sig figs

Answer 3

Okay, thank you :)

Answer 4

The final answer I came up with was 15.99

Answer 5

After I rounded it.. is that correct?

Answer 6

@ninab731

Answer 7

yes thats correct

Answer 8

Yep that's what I got too

Answer 9

Thank you both ! :)