Because they are good at their professions
Answer:
finding the mass percentage oven element in a compound might sound complicated, but the calculation is simple. For example, to determine the mass percentage of hydrogen in water H2O, divide the major mass of hydrogen by the total molar mass of water and then multiply the result by 100
Answer:
i would say D i just did this but i kinda forgot so sorry if im wrong or A
Explanation:
I recently wrote a paper on animal testing
Pretty sure it was Galen