William W. answered • 10/21/21
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Math and science made easy - learn from a retired engineer
Look on the periodic table and you will find arsenic at atomic number 33 with an atomic mass of 74.922. That means the mass of arsenic is 74.922 grams/mole. So we need to figure out how many moles there are in 4763 atoms.
Avogadro's number (6.022 x 1023) tells the number of atoms in one mole. So:
Then, we convert the number of moles to grams using the atomic mass:
