Question

1. use the data in this table to determine the atomic mass of copper.

64.00 u
63.55 u
62.93 u
64.93 u

Explanation:

Step1: Convert percentage to decimal

For Copper - 63: \(69.15\%=0.6915\)
For Copper - 65: \(30.85\% = 0.3085\)

Step2: Calculate weighted contribution

Contribution of Copper - 63: \(0.6915\times62.93\approx43.54\)
Contribution of Copper - 65: \(0.3085\times64.93\approx20.01\)

Step3: Sum the contributions

Atomic mass of copper: \(43.54 + 20.01=63.55\) u

Answer:

63.55 u