August 2018 1 16 Report
Jaki procent stanowi miedź w związku CuSO4• 5H2O?(Cu=64u, S=32, H=1u, O=16u)

A 25,6%
B 33,3%
C 40%
D 56,6%

(bardzo prosze o pokazania sposobu jak to zrobić)

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