January 2019 2 21 Report
Dobierz wspołczynniki w równaniach reakcji :
a ) Cu + O2 -----> Cu2O
b ) Si + N2 -----> Si3N4
c ) B2O3 + NH3 -----> BN + H2O
D ) Fe2O3 + H2 -----> Fe + H2O
e ) Cr + H2S -----> Cr2S3 + H2

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