General Chemistry Answers

state hess law

How to solve and prepare: Prepare 50 mL of 0.3N Ba (OH)2 * 8 H2O

Lead(ii) trioxonitrate (v) and sodium (ii) tetraoxosulphate(vi) solutions are mixed together to form crystals of lead (ii) tetraoxosulphate(vi) coming out of solution, leaving a solution of sodium trioxonitrate(v) in solution. Write the molecular equation and the net ionic equation for the reaction.

With suitable equations state the Arrhenius and Bromted and lawry definition of an acid and base

Using half-reaction method balance equation between magnesium metal and Nitrogen gas

A solution is prepared by dissolving 40.0 g of CoSO₄ in water. What current would be needed to deposit all of the cobalt in 6.0 hours?

a)0.12 A

b)0.038 A

c)2.3 A

d)1.2 A

Calculate the cell potential for the following reaction:

Ni(s) + 2 Cu⁺(0.010M) → 2 Cu(s) + Ni⁺²(0.0010M)

1. 0.40 V
2. -0.43 V
3. 0.43 V
4. 0.34 V
5. 0.77 V

Consider the reaction of iodine with manganese dioxide

3I₂(s) + 2MnO₂(s) + 8OH^-(aq)  ↔ 6I^-(aq) + 2MnO₄^-(aq) + 4H₂O(l)

The equilibrium constant for the overall reaction is 8.30 x 10^-7. Calculate ΔG° for the reaction at 25° C.

1. -15.1 kJ
2. -34.7 kJ
3. 15.1 kJ 
4. 34.7 kJ

The following half-reactions occur in the mercury battery used in calculators. If E° _cell = 1.357 V, calculate the equilibrium constant for the cell reaction at 25° C

HgO(s) + H₂O(l) + 2e^-  ↔ Hg(l) + 2OH^-(aq)

ZnO(s) + H₂O(l) + 2e^- ↔ Zn(s) + 2OH^-(aq)

1. 9.4 x 10²²
2. 7.5 x 10⁴⁵
3. 6.4 x 10⁶³
4. 7.8 x 10⁹¹

Which one of the following reagents is capable of transforming Fe⁺³ to Fe⁺² under standard-state conditions?

H₂(g)

NO₃^-(aq)

O₂(g)

Br^-(aq)

H⁺(aq)

The redox reaction of peroxydisulfate with bromide has been used for many years as part of a demonstration. If E° _cell = 1.49 V and E° _bromine = 1.09 V, what is E° _{peroxydisulfate}

S₂O₈^2-(aq) + 2H⁺ + 2Br^-(aq) → 2HSO₄^-(aq) + Br₂(aq)

1. 0.40 V
2. 2.58 V
3. -0.40 V
4. -2.58 V