The balanced equation of the reaction is,
"Na2CO3+2HNO3\\to2NaNO3+CO2+H2O"
Mole ratio is "1:2\\to2:1:1"
No of moles of "Na2CO3=\\dfrac {1.2g}{105.9g\/mol}"
"=0.01133mol"
"0.01133mol" of "Na2CO3" produced "0.01133mol" of "CO2" since the mole ratio is 1:1
At room temperature "1mol" "of CO2=24dm^3"
Therefore,
If "1mol=24dm^3"
"0.01133mol=??"
"=0.27dm^3"
Theoretical volume of carbon dioxide produced is "0.27dm^3"
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