Final answer:
To find the number of grams in 2.80x10^25 atoms of Lithium, we can use Avogadro's number to convert the atoms to moles and then multiply by the molar mass of Lithium.
Step-by-step explanation:
To determine the number of grams in 2.80x10^25 atoms of Lithium, we need to first find the molar mass of Lithium, which is approximately 6.94 grams per mole. Then, we can use Avogadro's number, which is approximately 6.02x10^23 atoms per mole, to convert the given number of atoms to moles.
Number of moles = (2.80x10^25 atoms) / (6.02x10^23 atoms per mole) = 4.65 moles
Finally, we can multiply the moles by the molar mass to find the number of grams.
Grams = (4.65 moles) * (6.94 grams per mole) = 32.243 grams