There are 6.02 × 1023 atoms in 1 gram of hydrogen. how many atoms are there in 800 grams of hydrogen? write your answer in scientific notation. if necessary, round your answer to the nearest hundredth. 4.82 × 1026 48.16 × 1025 4.82 × 1023 4.82 × 1020

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.