Homework Help: chemistry

Posted by Crsa on Monday, February 1, 2010 at 5:20pm.

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?

chemistry - bobpursley, Monday, February 1, 2010 at 5:38pm
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.
chemistry - DrBob222, Monday, February 1, 2010 at 5:41pm
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.

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