Question

HELP!!!

Answer 1

I got my answer by multiplying 6.02 x 1023 and i got 6,158.46 that is = to 1 so then divide that by 800 = 7.70 oops went ahead of myself, A/answer ='s C duh, did you even read the question?

Answer 2

Create a conversion factor from "There are 6.02 × 10^23 atoms in 1 gram of hydrogen:"

6.02*10^23 atoms
-------------------------
          1 gram

Then mult. 800 grams by this conversion factor:

6.02*10^23 atoms      800 grams
------------------------- * ----------------
          1 gram                     1

This comes out to 4816*10^23 atoms, which, in scientific notation, is 

4.816*10^26 atoms.