General Chemistry Answers

At a certain temperature, 0.820 mol SO₃ is placed in a 4.00 L container.

2 SO₃ (g) −⇀ 2 SO₂ (g) + O₂ (g)

At equilibrium, 0.150 mol O₂ is present. Calculate K_c.

K_c = ?

For this reaction

2 H₂O (g) −⇀ 2 H₂ (g) + O₂ (g)

the equilibrium concentrations were found to be [H₂O] = 0.250 M, [H₂] = 0.410 M,

and [O₂] = 0.750 M.

What is the equilibrium constant for this reaction?

K_c = ?

Write the equilibrium-constant expression for the reaction

A (s) + 3B (l) −⇀ 2C (aq) + D (aq)

in terms [A] , [B] , [C] , and [D] , as needed.

Note that K_c which is sometimes symbolized as K_eq denotes that the equilibrium constant is expressed using molar concentrations. For this question, K_c means the same thing as K_eq.

K_c = ?

Consider the reaction

PCl₅ (g) −⇀ PCl₃ (g) + Cl₂ (g)

K_c = 0.0420

The concentration of the products at equilibrium are [PCl₃] = 0.120 M and [Cl₂] = 0.190 M.

What is the concentration of the reactant, PCl₅, at equilibrium?

[PCl₅] = ?

If the initial reaction contains 1.73 M A, 1.01 M B, and 2.97 M C, calculate K_c for the new equilibrium reaction?

K_c = ?

The calcium and magnesium in a urine sample were precipitated as oxalates. A mixed precipitate of CaC2O4 and MgC2O4 resulted was heated to form CaCO3 and MgO. This second mixture weighed 0.0433g. After ignition to form CaO and MgO, the resulting solid weighed 0.0285g. What was the sum of masses of Ca and Mg in the original sample?

The concentration of calcium in urine is approximately 5mM. What is the maximum concentration of oxalate that can be tolerated and not precipitate CaC2O4?

The solubility of magnesium oxalate (MgC2O4)in urine is 0.0093 M. What is the solubility product, Ksp, of MgC2O4 in urine?

Stones form in the urinary tract when certain chemicals become too concentrated in urine. By far the most common kidney stones are those formed from calcium and oxalate. Magnesium is known to inhibit the formation of kidney stones. (a) The solubility of calcium oxalate (CaC2O4) in urine is 9x10^-5 M. What is the solubility product, Ksp, of CaC2O4 in urine?

Raffinose, the most abundant trisaccharide found in nature, occurs in whole grains and

numerous vegetables (e.g., asparagus, cabbage, and beans). Hydrolysis of raffinose yields galactose and sucrose. Provide the systematic name for this trisaccharide. Is raffinose a

reducing or nonreducing sugar? Is raffinose capable of mutarotation?