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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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https://brainmass.com/chemistry/reaction-stoichiometry/chemistry-stoichiometry-limiting-reactants-300925

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.

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Calculating the Equilibrium Constant: Change in Free Energy

Survey of physical chemistry

State all of the assumptions (e.g. ideal gas etc).

(previous reaction is 2H??2(g) + O2(g) ----> 2H2O(g))

Given the reaction in the previous question at 298 Kelvin where H2 has a partial pressure of 0.10 bar, O2 is at 0.20 bar, and H2o is at 1.5 bar:
(a) Determine the direction and quantify the change in free energy the reaction must undergo to reach equilibrium.

(b) Calculate the equilibrium constant.

(c) Illustrate the reaction on a plot of Free Energy versus % Reactants/Products (show ?GO, the approximate position of Q for the given partial pressures, and the position of Q at equilibrium).

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