Question

What is the relative atomic mass of copper when 25% of the atoms are an isotope with mass number 37 and 75% of the atoms are an isotope with mass number 35?

Answer 1

The relative atomic mass of copper with 25% copper-37 and 75% copper-35 is calculated as a weighted average, resulting in 35.50 amu.

Step-by-step explanation:

The relative atomic mass of copper when 25% of the atoms are an isotope with mass number 37, and 75% are an isotope with mass number 35, is calculated by taking the weighted average of the masses of the isotopes based on their abundance. The calculation is as follows:

• (0.25 × 37) + (0.75 × 35) = 9.25 + 26.25
• Total = 35.50 u

So, the relative atomic mass of copper in this case is 35.50 atomic mass units (amu).