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1. Na2CO3+2HCl--->2NaCl+H2O+CO2
33g xdm3
106g---22,4dm3
33g---x dm3
x=33g*22,4dm3/106g
x=6,97 dm3
2. 12g 22,4dm3
C+O2--->CO2
16g xdm3
12g---22,4dm3
16g---x dm3
x=16g*22,4dm3/12g
x=29,87 dm3