Naturally occurring neon (Ne)has the following isotopic composition (the mass of each isotope is given in parenthesis). Calculate the atomic weight of neon in u from these data: neon-20, 90.92% (19.99 u); neon-21, 0.257% (20.99 u); neon-22, 8.82% (21.99 u)
A)28.97
B)37.62
C)2017
D)20.17

Question

Naturally occurring neon (Ne)has the following isotopic composition (the mass of each isotope is given in parenthesis). Calculate the atomic weight of neon in u from these data:  neon-20, 90.92% (19.99 u); neon-21, 0.257% (20.99 u); neon-22, 8.82% (21.99 u)
A)28.97
B)37.62
C)2017
D)20.17

Quizplus · Accepted Answer

The atomic weight of neon can be calculated by multiplying the abundance of each isotope by its mass and then summing these values. For neon, this calculation is as follows: (0.9092 * 19.99 u) + (0.00257 * 20.99 u) + (0.0882 * 21.99 u) = 18.168708 + 0.0539433 + 1.939178 = 20.1618293 u, which rounds to 20.17 u.

Naturally Occurring Neon (Ne)has the Following Isotopic Composition (The Mass