1. The radius of a nickel atom is 125 pm. How many nickel atoms would have...

Question

Question

1. The radius of a nickel atom is 125 pm. How many nickel atoms would have to be laid side by side to span a distance of 1.78 mm?

2. The mass of a single iridium atom is 3.19×10^-22 grams. How many iridium atoms would there be in 126 milligrams of iridium?

3. The volume of a single platinum atom is 1.12×10^-23 cm³. What is the volume of a platinum atom in microliters?

Answer 1

Answer #1

Ans 1 :

The diameter of atom is equal to : 2 x radius

So here , the diameter of nickel atom will be : 2 x 125 pm = 250 pm

The distance to be covered = 1.78 mm = 1.78 x 10⁹ pm

So the number of nickel atoms will be equal to :

= distance / diameter of one atom

= ( 1.78 x 10⁹ pm) / 250

= 7120000 nickel atoms

Answer 2

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