Answer: 86.1
Explanation: because i did this in 7th grade
Galileo said that the Sun revolved around the Earth, and that the Earth was the center of the universe ! (:
To calculate the atomic mass<span> of a single </span>atom<span>, add up the </span>mass<span> of protons and neutrons.
So, your answer would be A) add the number of protons and neutrons</span>
Water is a pure substance because it is not refined like the other materials. Hope this helps!!!
