Asingle atom of platinum has a mass of 3.25x10^-22g. what is the mass of 6.0x10^23 platinum atoms?

                    194.36 g

Data Given:

                 Number of Atoms  =  6.0 × 10²³

                 A.Mass of Platinum  =  195.08 g.mol⁻¹

Step 1: Calculate Moles of Platinum,

                   Moles  =  Number of Atoms ÷ 6.022 × 10²³ Atoms.mol⁻¹

Putting value,

                   Moles  =   6.0 × 10²³ Atoms ÷ 6.022 × 10²³ Atoms.mol⁻¹

                   Moles  =  0.9963 mol

Step 2: Calculate Mass of Platinum:

                   Moles  =  Mass ÷ M.Mass

Solving for Mass,

                   Mass  =  Moles × M.Mass

Putting values,

                   Mass  =  0.9963 mol × 195.08 g.mol⁻¹

                   Mass  =  194.36 g

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