General Chemistry Answers

Calculate the volume of oxygen produced at s.t.p when a concentrated aqueous solution of sodium sulfate is electrolysed for 55.0mins by passing a current of 0.70A through it

Solve the following problem.

1. Calculate the oH of a butter system containing 1.0 M CH3COOH and 1.0 M CH3COONa.

2. What is the pH of the butter system after the addition of 0.10 mole of gaseous HCI to 1 L of the solution.

Identify the butter systems below.

1. KH2PO4 / H3PO4

2. NaCIO4 / HCIO4

3. KF / HF

4. KBr / HBr

5. NaCO3/ NaHCO3

Solve the following problem.

1. The concenration of H+ ions in a bottle of table wine was 3.2 x 10^-4 M right after the cork was removed. Only half of the wine was consumed. The other half, after it had been standing open to the air for a month, was found to have a H+ ion concentration equal to 1.0 x 10^-3 M. Calculate the pH of the wine on each of these occasions.

2. The pH of rainwater collected in ANHS on particular day was 4.82. Calculate the H+ ion concentration of the rainwater.

3. Find the pH if the [OH-] is equal to 1.0 x 10^-6 M.

Identify the acids and bases in each of the following reactions.

1. CN- + H2O <--> HCN + OH-

2. HNO2(aq) + H2O(l) <--> + H3O+ (aq)

3. NH3(aq) + H2O(l) <--> NH4+ (aq) + OH-(aq)

4. H2O + HCI <--> H3O+ + Cl-

5. NH3 + HF <--> NH4+ F

Answer the following problem

A. 1.00 Mole sample of NOCI was placed in a 2.00 L reactor and heated to 227°C until the system reached equilibrium. The contents of the reactor were then analyzed and found to contain 0.056 mole of CI2. Calculate K at this temperature. The equation is as follows:

2NOCI(g) <--> 2NO(g) + CI2(g)

Write the equilibrium constant expression for each of the following reactions.

1. H2(g) + I2(g) <--> 2H(g)

2. 3O2(g) <--> 2O3(g)

3. 2CO 2(g) <--> 2CO(g) + O2(g)

4. CH3COOH(aq) + C2H5OH <--> CH3COOC2H5(aq) + H2O(l)

5. AgCl(s) <--> Ag+ (aq) + Cl- (aq)

Give an example of a chemical reaction in chemical equilibrium. Define chemical equilibrium using your chemical equation.

1. For the reaction, H2O(l) --> H2O (g), calculate ∆G at a) 20°C b) 100°C c) 150°C

2. Calculate the standards-free energy changes for the reaction 2MgO(s) + 2Mg(s) + O2(g) at 25°C

Determine if liquid water will spontaneously freeze at -10.00°C? It is spontaneously at +10.00°C? What can you say about the values of ∆Suniv?