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Empirical Formula of Decomposition Reaction

APCHEM-1ZGGXE

A 15.0 g sample of copper carbonate is heated to form 9.65 g of $CuO$ and 5.34 g $CO_2$.

Which of the following is the empirical formula of this copper carbonate sample?

A

$Cu_2CO_3$

B

$CuCO_3$

C

$CuCO$

D

$Cu_3CO_3$