On a mission to a newly discovered planet, an astronaut finds copper abundances of 69.97 % for 63Cu and 31.03 % for 65Cu. What is the atomic mass of copper for this location?
The mass of 63Cu is 62.9300 amu. The mass of 65Cu is 64.9200 amu.
Express your answer to two decimal places, and include the appropriate units.
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