Marnett930 Marnett930

24-08-2014
Chemistry

Answered

Element X is found in two forms: 90.0% is an isotope that has a mass of 20.0, and 10.0% is an isotope that has a mass of 22.0. What is the atomic mass of element X?

A20.0
B20.2
C20.8
D21.2
E21.8

Can anyone explain this one for me?

Verified Answer :

pyromorphite pyromorphite

24-08-2014

\(M_{X} = \frac{(20.0\cdot 90\%)+(22.0\cdot10\%)}{100\%} = \frac{2020}{100} = 20.2[u]\)

answer: B

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