Chemistry Answers

What is the complete set of quantum numbers for the last entering electron of Nickel, Xenon and Bromine?

A given mass of nitrogen is 0.12 dm³ at 60⁰C and 1.01×10⁵ Nm–². Find it's pressure at the same temperature if it's volume is changed to 0.24 dm³.

Nitrogen gas and hydrogen gas are combined in a reaction to produce ammonia. If 6.0 moles of N2 and 6.0 moles of H2 are present in the mixture, which is the limiting reactant? 

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9. Elements with very large ionization energies also tend to have highly exothermic electron affinities. Explain

Given the ΔH° and ΔS°, calculate the G° values for the following reactions and indicate whether the reaction is spontaneous at standard conditions. If a reaction is not spontaneous, state what may be done to make the reaction spontaneous.

H° (kJ)

a. C (graphite) + 2 H2(g) ➡️ CH4(g) -74.9

b. CH3CH3(g) ➡️ H2(g) + C2H4(g) +137

c. N2(g) + 2 H2(g) ➡️ N2H2(L) +50

S°(kJ)

a. C (graphite) + 2 H2(g) ➡️ CH4(g)

+186.3

b. CH3CH3(g) ➡️ H2(g) + C2H4(g)

+121

c. N2(g) + 2 H2(g) ➡️ N2H2(L)

-331

Determine the pH of the buffer solution produced by the reaction of 5 mL 0.1 M KOH and 30 mL 0.1 M CH3COOH . The pKa of acetic acid is 4.76.

Find the pH of a solution produced by the reaction of 250 mL 0.1 M NaOH and 150 mL 0.03

M acetic CH3COOH Note that the pKa of acetic acid is 4.76.

Write chemical reaction to produce phosphatidyl choline from phosphatidic acid.

Write the oxidation half-reaction and reduction half-reaction, and shorthand electrochemical notation for the following.

1. Mg+H^+ -> Mg^ 2+ +H 2

2. KI + Cl2 -> KCl + I2

3. Cr^ + +Sn^ 4+ Cr^ 3+ +Sn^ 2+

4. 3 Hg^ 2+ +2 Fe (s) 3 Hg 2 +2 Fe^ 3+

5. 2 As (n) + 3 Cl₂ (g) → 2 AsCla

6. NaBr + Cl₂ ⇒ NaCl + Br₂

7. F*e_{2}*O_{3} + CO -> Fe + C*O_{2}

8. CO + I_{2}*O_{5} -> C*O_{2} + I_{2}

2 Fe^ 3+ (aq) +Sn^ 2+ 2 Fe^ 2+ +Sn^ 4+ (aq)

10. Chlorine gas oxidises Fe2+ ions to Fe³+ ions. In the process, chlorine is reduced to chloride ions.

Calculate the entropy change, So for the following process.

a. Melting of ice at 0°C (heat of fusion of ice is 6.02 kJ/mol)