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A sample of washing soda has the following composition by mass: - Na₂CO₃: molecular mass 106.0, mass percentage 84.8 - NaHCO₃: molecular mass 84.0, mass percentage 8.4 - NaCl: molecular mass 58.5, mass percentage 6.8 If 1 kg of this sample is treated completely with excess HCl, the amount of carbon dioxide released will be:

1. 9 mol of CO₂
2. 16 mol of CO₂
3. 17 mol of CO₂
4. 18 mol of CO₂

Correct answer: 17 mol of CO₂

Solution

The correct option is 17 mol of CO₂ because the moles of CO₂ produced from the complete reaction of Na₂CO₃ and NaHCO₃ with HCl can be calculated based on their respective mass percentages and stoichiometry, leading to a total of 17 moles.

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