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    Chemistry Stoichiometry - Limiting Reactants

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    The fizz produced when an Alka-Seltzer® tablet is dissolved in water is due to the reaction between sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7): 3NaHCO3(aq)+H3C6H5O7(aq)>>3CO2(g)+3H2O(l)+Na3C6H5O7(aq)
    In a certain experiment 1.05g of sodium bicarbonate and 1.05g of citric acid are allowed to react.

    - Which is the limiting reactant? Sodium bicarbonate or citric acid?
    - How many grams of carbon dioxide form?
    - How many of grams of the excess reactant remain after the limiting reactant is completely consumed?

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    Solution Preview

    - Which is the limiting reactant? Sodium bicarbonate or citric acid?

    3 NaHCO3(aq) + H3C6H5O7(aq) → 3 CO2(g) + 3 H2O(l) + Na3C6H5O7(aq)

    moles of NaHCO_3=1.05 g NaHCO_3×(1 mol NaHCO_3)/(84.006 g NaHCO_3 )
    =0.012499 mol NaHCO_3

    moles of〖 H〗_3 C_6 H_5 O_7=1.05 g 〖 H〗_3 C_6 H_5 O_7×(1 mol 〖 H〗_3 C_6 H_5 O_7)/(192.12532 g H_3 C_6 H_5 O_7 ...

    Solution Summary

    The solution shows in steps how to determining the limiting reactant and the amount of grams that are formed from carbon dioxide and excess reactants.