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Find the average atomic mass for X if 19.9% of X atoms are 10X with a mass of 12.0324371 amu and 80.1% are 11X with a mass of 15.01274 amu.
a) 23 amu
b) 12.3 amu
c) 14.4 amu
d) 35.45 amu

Sagot :

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