Respuesta :
Answer:
The mass of calcium in the given number of atoms is 797.2 g.
Explanation:
[tex]N=n\times N_A[/tex]
N = Number of atoms/molecules
n = Moles of compound
[tex]N_A[/tex] = Avogadro number = [tex]6.022\times 10^{23} mol^{-1}[/tex]
We have:
Number calcium atoms = [tex]N=1.20\times 10^{25}[/tex]
n = moles of calcium = ?
[tex]n=\frac{N}{N_A}=\frac{1.20\times 10^{25}}{6.022\times 10^{23} mol^{-1}}[/tex]
n = 19.93 mol
Atomic mass of calcium = 40 g/mol
Mass of 19.93 moles of calcium = 40 g/mol × 19.93 mol=797.2 g
The mass of calcium in the given number of atoms is 797.2 g.
