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6. In nature, in a stable state hydrogen has two kinds of isotopes, namely 99.985% ¹H with an atomic mass of 1.00783 sma and 0.015% ²H with an atomic mass of 2.01410 sma. The average atomic mass of hydrogen is .... (in sma)

a. 1.00150

b. 1.00324

c. 1.00798

d. 1.01528

e. 1.07960

Note : all H have the number 1 below ₁H

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