As the chemical reaction proceeds, a gas is formed with the water molecule and CH₃COONa, so the mass of the remaining solid product is less than 345 g.
Stoichiometry tells about the relative amount of reactants and products before and after the reaction in terms of coefficient.
Given chemical reaction is:
NaHCO₃ + CH₃COOH → CH₃COONa + CO₂ + H₂O
From the stoichiometry of the reaction it is clear that 1 mole of both the reactants will form products. And for the formation of product amounts of the reactants get wholly consumed. From 345 grams of reactants carbon dioxide gas, water and sodium acetate salt is formed, so the mass of this formed salt is less than 345 grams.
Hence, option (C) is correct i.e. less that 345g.
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