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

pure substance: iron,copper

impure substance: water,charcoal

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )