The number of platinum (pt) atoms in the cube is 6.6* 10⁻²² .
Number of atoms in a molecule of given weight can be calculated by dividing the total mass of molecule by mass of single atom .
we have provided the following informations,
length of edge = 1.10 cm
density of platinum (pt) = 21.45 g/cm³
Mass of single platinum (pt) atom
= 3.2×10⁻²² g
For calculating the number of platinum atoms present in cube first we find out the amount of platinum present in grams.
density of atom = mass of atom (grams) / Volume of solution(cm³).
21.45 g/cm³ = mass of pt in grams /1.0cm³
mass of platinum present in grams
=21.45 g
Using the Atomicity, number of atoms present is
21.45 g / 3.2 × 10⁻²²g = 6.6 × 10⁻²²platinum atoms.
Therefore, the number of platinum (pt) atoms is 6.6× 10⁻²² .
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