Question

The average atomic mass of boron can vary depending on the source. Calculate the percent abundances leading to the two values of the average atomic masses of boron from Turkey (10.807 amu) and the United States (10.819 amu).

a) Turkey: 19.82%, 80.18%; United States: 10.67%, 89.33%

b) Turkey: 10.67%, 89.33%; United States: 19.82%, 80.18%

c) Turkey: 80.18%, 19.82%; United States: 89.33%, 10.67%

d) Turkey: 89.33%, 10.67%; United States: 80.18%, 19.82%

Answer 1

The percent abundances leading to the two values of the average atomic masses of boron from Turkey and the United States are: Turkey - 19.82% ^10B, 80.18% ^11B; United States - 10.67% ^10B, 89.33% ^11B.

Step-by-step explanation:

Boron has two naturally occurring isotopes: ^10B and ^11B. The average atomic mass of boron can vary depending on the percent abundances of these isotopes.

To calculate the percent abundances leading to the two values of the average atomic masses of boron from Turkey (10.807 amu) and the United States (10.819 amu), we compare the isotopic masses and the given average atomic masses.

In Turkey, the average atomic mass of boron is closer to the mass of ^10B (10.0129 amu) than ^11B (11.00931 amu), indicating a higher percentage of ^10B. Therefore, the percent abundances from Turkey are 19.82% ^10B and 80.18% ^11B.

In the United States, the average atomic mass of boron is closer to the mass of ^11B, suggesting a higher percentage of ^11B. Thus, the percent abundances from the United States are 10.67% ^10B and 89.33% ^11B.