3. Calculate the number of particles for each of the following: a) 2.5 mol Ca
b) 7.26 mol Al
c) 3.89 mols
d) 1.35 mol Pb

a.  1.505 x 10²⁴

b.  4.37 x 10²⁴

c.  2.34 x 10²⁴

d.  8.127 x 10²³

Given

Number of moles of elements

Required

The number of particles

Solution

1 mol = 6.02 x 10²³ particles(molecules, ions, atoms)

Can be formulated :

N = n x No

No = Avogadro's number

n = mol

a. 2.5 mo Ca x 6.02 x 10²³ = 1.505 x 10²⁴

b. 7.26 mol Al x 6.02 x 10²³ = 4.37 x 10²⁴

c. 3.89 mol S x 6.02 x 10²³ = 2.34 x 10²⁴

d. 1.35 mol Pb x 6.02 x 10²³ = 8.127 x 10²³

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