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  • The three stable isotopes of neon: 20 10 Ne, 21 10 Ne and 22 10 Ne have respective abundances of 90.51%, 0.27% and 9.22%. Obtain the average atomic mass of neon.

Q. 13.2  The three stable isotopes of neon: _{10}^{20}\textrm{Ne}, _{10}^{21}\textrm{Ne} and _{10}^{22}\textrm{Ne} have respective abundances of   90.51\; ^{o}/_{o}, 0.27\; ^{o}/_{o} and 9.22\; ^{o}/_{o}. The atomic masses of the three isotopes are 19.99\; u, 20.99\; u \; \; and\; \; 21.99 \; u, respectively. Obtain the average atomic mass of neon.

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The atomic masses of the three isotopes are 19.99 u(m1), 20.99 u(m2) and 21.99u(m3)

Their respective abundances are 90.51%(p1), 0.27%(p2) and 9.22%(p3)

\\m= \frac{19.99\times 90.51+20.99\times 0.27+21.99\times 9.22}{100}\\m=20.1771u

The average atomic mass of neon is 20.1771 u.

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