Question

1/5 Hydrogen is 99% Hydrogen-1, 0.80% Hydrogen-2, and 0.20% Hydrogen-3. Calculate its average atomic

A. 1.018 amu
B. 1.006 amu
C. 1.012 amu
D. 1.104 amu

Answer 1

The correct option is C). The average atomic mass of hydrogen, considering the relative abundances and masses of its isotopes, Hydrogen-1, Hydrogen-2, and Hydrogen-3, is calculated to be approximately 1.012 amu.

Step-by-step explanation:

To calculate the average atomic mass of hydrogen, we consider the abundance and atomic mass of each isotope: Hydrogen-1 (99%), Hydrogen-2 (0.80%), and Hydrogen-3 (0.20%). The atomic masses are 1 amu, 2 amu, and 3 amu for Hydrogen-1, Hydrogen-2, and Hydrogen-3, respectively.

The calculation is as follows:

• (0.99 × 1 amu) + (0.008 × 2 amu) + (0.002 × 3 amu)
• (0.99 amu) + (0.016 amu) + (0.006 amu)
• 1.012 amu (rounded to three decimal places)

Therefore, the average atomic mass of hydrogen is approximately 1.012 amu, which corresponds to the answer choice C.