General Chemistry Answers

Differentiate hydrogen ion from hydroxide ions in all aspect not just the 

structure.

Based on the heat of formation of MnO, which is -385.2 KJ/mol, how much energy is required to DECOMPOSE 35.5 g of MnO into its elements?

. A galvanic cell consists of one half-cell with zinc metal immersed in 1.0 M Zn 2+ solution and another half-call with P metal immersed in 1.0 M P 3+ solution. The cell potential, Ecell is recorded as +2.26V at standard conditions. If the electrode P shows increase in weight, (a) Draw the galvanic cell based on the statements above. (b) Write the half-cell equation of the anode and cathode. (c) Write the overall cell reaction equation. (d) Write the cell notation of the electrochemical cell. (e) Calculate the standard electrode potential for P 3+ /P electrode [E°Zn 2+ /Zn = -0.76] 

A gaseous fuel mixture contains 20.9% methane (CH4), 43.2% ethane (C2H6) and the rest propane (C3H8) by volume. Part A When the fuel mixture contained in a 1.58 L tank, stored at 748 mmHg and 298 K, undergoes complete combustion, how much heat is emitted? (Assume that the water produced by the combustion is in the gaseous state.) Express your answer with the appropriate units.

A compound containing chromium and sulfur contains 76.4 mass percent chromium.

Determine its empirical formula.

Write equilibrium expression in terms of Kc for each of the following reaction:

a. 𝑁𝑖(𝑠) + 4𝐶𝑂(𝑔) ⇌ 𝑁𝑖(𝐶𝑂)4 (𝑔)

b. 𝐶𝑎(𝐻𝐶03)2(𝑎𝑞) ⇌ 𝐶𝑎𝐶𝑂3(𝑠) + 𝐻2𝑂(𝑙) + 𝐶𝑂2(𝑔)

An ideal gas occupies a volume of 1.5 dm3 under a pressure of 100.5 kPa. Assume that the temperature is maintained constant, calculate its volume if the pressure is increased to 150 kPa.

Consider the following reaction at equilibrium

𝐻2(𝑔)+𝐶𝑂2(𝑔)⇌𝐻2𝑂(𝑔)+𝐶𝑂(𝑔) ∆𝐻=+𝑣𝑒

How will the amount of H2 change if:

a. CO2 is added?

b. H2O is added?

c. A catalyst is added?

d. The temperature is increased?

e. The volume of the container is decreased?

The molar mass of platinum is 195 g/mol. NA = 6.02 x 1023 units/mol

a- Find the number of moles present in 3.2 g of a platinum sample.

b- What is the mass of 2.75 x 10 24 atoms of platinum?

For the reaction A(aq)+B(aq)----- C(aq)+D(aq) the equilibrium constant is 24.6 at 25 0176°C and 37.6 at 50°C What is the value of satndard Gibbs free energy change (in Kj) of this reaction at 75 °C