If 21g of NaHCO3 is added to 15g of CH3COOH solution, the residue is found to weigh 25g. what is the mass of CO2 is released in the reaction?
A
11g
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B
12g
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C
13g
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D
10g
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Solution
The correct option is A11g Before the reaction: NaHCO321g+CH3COOH15g→CH3COONa+H2O+CO2 Total mass before the reaction =21+15 Mass of the residue after the reaction=25g let x gram of CO2 be liberated Total mass after reaction =25+x According to the law of conservation of mass, Δm=0 i.e., massafterthereaction−massbeforethereaction=0(i) 25+x−36=0 or x=36−25=11g Therefore, mass of CO2 released = 11g