Question

The atomic musses of N (99. 64 percent) and 1N (0.36 percent) are 14.00307 amu and 15.0001 amu, respectively. Calculate the average atomic mass of nitrogen. The percentages in parentheses denote the relative abundances C01​?

Answer 1

14.01 amu

Step-by-step explanation:

Step 1: Given data

Isotope Atomic mass (am) Abundance (ab)

¹⁴N 14.00307 amu 99.64% (0.9964)

¹⁵N 15.0001 amu 0.36% (0.0036)

Step 2: Calculate the average atomic mass (aam) of nitrogen

We will use the following expression.

aam = ∑ am × ab

aam = 14.00307 amu × 0.9964 + 15.0001 amu × 0.0036 = 14.01 amu