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(the answer is at the bottom of all this text.)
to calculate the number of atoms in 149 grams of calcium, w can use the following steps:
find the molar mass of calcium (Ca) from the periodic table. the molar mass of calcium is approximately 40.08 grams/mole.
calculate the number of moles of calcium in 149 grams using the formula:
moles = Mass (grams) / Molar Mass (grams/mole)
moles = 149 g / 40.08 g/mole ≈ 3.72 moles
use avogadro's number, which is approximately 6.022 x 10^23 atoms/mole, to find the number of atoms in the calculated moles.
number of atoms = Moles x Avogadro's Number
number of atoms = 3.72 moles x 6.022 x 10^23 atoms/mole ≈ 2.24 x 10^24 atoms
so, there are approximately 2.24 x 10^24 atoms in 149 grams of calcium.