To find the number of atoms in 143 grams of calcium, we first need to determine how many moles of calcium that represents. The atomic mass of calcium is approximately 40.08 grams per mole.
We can use the formula:
Number of moles = mass (g) / atomic mass (g/mol)
Plugging in the numbers:
Number of moles = 143 g / 40.08 g/mol ≈ 3.56 moles
Next, we use Avogadro’s number to find the number of atoms in these moles. Avogadro’s number is approximately 6.022 x 10²³ atoms/mole.
Now, we can calculate the total number of atoms:
Number of atoms = number of moles × Avogadro’s number
Number of atoms ≈ 3.56 moles × 6.022 x 10²³ atoms/mole ≈ 2.14 x 10²⁴ atoms
So, in 143 grams of calcium, there are approximately 2.14 x 10²⁴ atoms.