Relate equilibrium concentrations of reactants and products

For the following reaction, what is the final concentration of Na₂SO₄(aq) if we start with 2.00 mol NaOH(aq) in 2.00 L of water? Assume any water created in the process can be ignored.

The rusting of iron can be described by the following reaction:

If 1.00 mol of Fe(OH)₃ (iron rust) is produced in a 3.00 L vessel from excess iron and water, what was the concentration of oxygen used?

In the following reaction, if there are 2.00 g of tin oxide to start with and excess hydrogen, what is the ratio between solid tin and water at equilibrium?

Using the following reaction, what is the final concentration of KCl if we start with 1.00 mol HCl in 1.00 L of water? Assume that any amount of water added is negligible.

In the following reaction, what is the final concentration of potassium nitrate (KNO₃) if we start with 0.50 mol potassium chloride (KCl) in 1.00 L of water?

What is the ratio of hydrogen to chlorine in the following acid dissociation if the concentration of hydrogen is 1.50 M and chlorine is 1.00 M?

In the following combustion reaction, what is the ratio of the initial concentration of oxygen to the final concentration of oxygen in a sealed 2.00 L container? Initial amount of oxygen is 4.00 moles and the final amount is 2.50 moles. 

What is the final concentration of oxygen in the following reaction if 2.00 moles of oxygen are present at the beginning of the reaction with excess nitrogen in a 10.00 L container?

For the following reaction, hydrogen gas is the byproduct of the hydrolysis of water. If there are 2.00 moles of water and 0.25 moles of hydrogen dissolved into the water at equilibrium, what is the concentration of dissolved hydrogen gas?

For the following reaction, what is the final concentration of hydrogen gas if excess arsenic is added to 12.0 moles of sodium hydroxide in a 5.00 L open-air container? 

If both compounds in the following generic formula initially are found to be 4.00 M and are used up until they both reach 1.00 M, what is the difference between the ratios of the starting molarities and the ending molarities? 

In the acid dissociation reaction below, HCl will dissociate completely. What is the initial concentration of HCl if 0.200 mol of chlorine and 2.20 mol of water are present at the end of the reaction?

In the following reaction, what is the concentration of H₂ at equilibrium if there are 1.00 moles of Cl₂ at equilibrium? There are 5.50 moles of H₂ and 4.00 moles of Cl₂ at the beginning of the reaction mixed in a 2.00 vessel container.

In a combustion reaction, a hydrocarbon is burned in the presence of oxygen and carbon dioxide as well as water are given off as products. If 2.50 grams of methane are burned in a closed 5.00 L vessel with excess oxygen, what is the equilibrium concentration of carbon dioxide?

Photosynthesis requires carbon dioxide and water to create glucose and oxygen in the leaf of a plant. If 3.00 moles of carbon dioxide are used up by a plant that has 40.00 moles of water to begin with, what is the concentration of glucose if only these reactants and products are present in the leaf?