Answer:
The mass of 2.08 x 10²² atoms of Ca = 1.38 g
Further explanation
A mole is the number of particles (atoms, molecules, ions) contained in a substance that is the same amount as many atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
N = n x No
No = 6.02.10²³ = Avogadro's number
Given
2.08 x 10²² atoms of Ca
Required
The mass
Solution
mol of Ca :
n = N : No
n = 2.08 x 10²² : 6.02.10²³
n = 0.0345
Mass of Ca(Ar=40 g/mol) :
= mol x MW
= 0.0345 x 40
=1.38 g
Explanation:
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