Answer:
6.94 amu
Explanation:
Step 1: Given data
- Mass of ⁶Li (m⁶Li): 6.0151223 amu
- Abundance of ⁶Li (ab⁶Li): 7.5% (0.075)
- Mass of ⁷Li (m⁷Li): 7.0160041 amu
- Abundance of ⁷Li (ab⁷Li): 92.5% (0.925)
Step 2: Calculate the average atomic mass (aam) of Li
We will use the following expression.
aam = m⁶Li × ab⁶Li + m⁷Li × ab⁷Li
aam = 6.0151223 amu × 0.075 + 7.0160041 amu × 0.925
aam = 6.94 amu
