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Question

In a chemical reaction, 300 g baking soda mixture containing sodium bicarbonate and vinegar on heating gives 174 g carbon dioxide gas. How much solid residue would be left over?

A
104 g
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B
118 g
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C
126 g
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D
128 g
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Solution

The correct option is C 126 g
We know,
According to law of conservation of mass,
Total mass of reactants = total mass of products
Here,
Mass on the reactant side =300 g
Given,
Mass of CO2 liberated =174 g
So, from the law of conservation of mass,
300 g = mass of residue + mass of CO2
mass of residue=(300174) g=126 g


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