General Questions These questions are not explicitly keyed to chapter topics; many requ...

General Questions

These questions are not explicitly keyed to chapter topics; many require integration of several concepts.

The chemistry of compounds composed of a transition metal and carbon monoxide has been an interesting area of research for more than 70 years. Ni(CO)₄ is formed by the reaction of nickel metal with carbon monoxide.

(a) If you have 2.05 g CO, and you combine it with 0.125 g nickel metal, how many grams of Ni(CO)₄ can be formed?

(b) An excellent way to make pure nickel metal is to decompose Ni(CO)₄ in a vacuum at a temperature slightly higher than room temperature. If the molar enthalpy of formation of Ni(CO)₄ gas is -602.9 kJ/mol, what is the enthalpy change for this decomposition reaction?

In an experiment at 100. °C it is determined that with 0.010 mol Ni(CO)₄(g) initially present in a sealed 1.0-L flask, only 0.000010 mol remains after decomposition.

(c) What is the equilibrium concentration of CO in the flask?

(d) What is the value of the equilibrium constant K_c for this reaction at 100. °C?

(e) Predict whether there is an increase or a decrease in entropy when this reaction occurs.

(f ) Calculate the equilibrium constant K_P for this reaction at 100. °C.