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Number of moles of $CO_2$: $0.376.\ g\div 44.01\ g/mol= 8.54\ mmol$, same as carbonate, from stoichiometry. Molar mass: $1.056\ g\div 0.00854\ mol= 123.60\ g/mol$ Atomic weight of M: $63.60\ g/mol$, closest to Cu
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