Question

I somehow keep getting this wrong. I also put 21.10 and 21.11. What am I doing wrong? Question: An element has the masses and relative abundances shown below. What is its average atomic mass?

Answer 1

21.06 amu

Step-by-step explanation

The way to do the question is 0.9523*21.01+0.0477*22.01, and you seem to have arrived at the answer of 21.0577 and then chopped off the last two digits. Instead of chopping off the last two digits, you should round the number, so the answer would be 21.06 instead of 21.05