posted by Crsa on .
The diameter of the tungsten wire in a light bulb filament is bery small, less than two thousandths of an inch, or about 1/20 mm. THe mass of the filament is so very small - 0.0176 grams - that it would take 1,600 filaments to weigh an ounce! How many tungsten atoms are in a typical light bulb filament?
Find the atomic mass number of W. THen multipy that by the mass of a neutron (proton is about the same).
Then divide that into .0176grams. You may have to change units, depending on the mass units for the W atom.
moles W = grams/atomic mass. You have the grams and you can look up the atomic mass. Calculate moles W.
There are 6.02 x 10^23 atoms of W in a mole of W.
5.76 multiplied by 10 to the 19th power. Labeled as atoms.