4. select the answer from the menu.\nthe natural isotope abundance of copper is shown on the table\nnatural…
4. select the answer from the menu.\nthe natural isotope abundance of copper is shown on the table\nnatural isotope abundance\n| isotope | percent abundance |\n| copper - 63 | 69.2% |\n| copper - 65 | 30.8% |\nthe average atomic mass of copper is - choose the correct answer - amu\nclear all\nchoose the correct answer\n63.1\n63.6\n64.0\n64.4
Answer
Explanation:
Step1: Convert percentages to decimals
Copper - 63 has an abundance of $69.2%=0.692$, copper - 65 has an abundance of $30.8% = 0.308$.
Step2: Calculate the contribution of each isotope
The atomic mass of copper - 63 is 63 amu and of copper - 65 is 65 amu. The contribution of copper - 63 is $63\times0.692 = 43.596$ amu, and the contribution of copper - 65 is $65\times0.308=20.02$ amu.
Step3: Calculate the average atomic mass
Add the contributions of the two isotopes: $43.596 + 20.02=63.616\approx63.6$ amu.
Answer:
63.6