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14 July, 18:37

A 10.17-g sample of solid sodium bicarbonate (the active ingredient in baking soda) completely decomposes into solid sodium hydroxide and carbon dioxide gas when heated. After the sodium hydroxide cools, it has a mass of 4.84 g. According to the law of conservation of mass, what mass of carbon dioxide must have been formed?

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  1. 14 July, 18:54
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    5.33 g

    Explanation:

    Let's consider the balanced reaction for the complete decomposition of solid sodium bicarbonate to form solid sodium hydroxide and carbon dioxide gas when heated.

    NaHCO₃ (s) → NaOH (s) + CO₂ (g)

    According to Lavoisier's law of conservation of mass, the sum of the masses of the reactants is equal to the sum of the masses of the products. Then,

    m (NaHCO₃) = m (NaOH) + m (CO₂)

    m (CO₂) = m (NaHCO₃) - m (NaOH)

    m (CO₂) = 10.17 g - 4.84 g

    m (CO₂) = 5.33 g
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