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Tungsten is the metal used in the filaments of incandescent light bulbs. Naturally occurring tungsten consists of five isotopes with the following isotopic masses and abundances:



Calculate the atomic mass of naturally occurring tungsten to five significant figures.

Tungsten is the metal used in the filaments of incandescent light bulbs. Naturally occurring tungsten consists of five isotopes with the following isotopic mass class=

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ZavierL

Each of the Isotopic mass its Abundance Sum together divide by 100. 
(179.9467060.12 + 181.94820626.5 + 182.950224514.3 + 183.950932630.64 + 185.95436228.43  ) / 100 
You get 183.84 (5s.f. ) or (183.8417786) 
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diene

To calculate the average atomic mass, multiply the mass of the isotope by its corresponding abundance:
179.946706 .0012 + 181.948206 .2650 + 182.9502245 .1431 + 183.9509326 .3064 + 185.954362 * .2843 = 183.84178 = 183.84

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