Which of the following reactions shows the greatest increase in entropy?
|A)||SO3(g) -----> 2 SO2(g) + O2(g)|
|B)||H2O(l) ----> H2O(s)|
|C)||Br2(l) ----> Br2(g)|
|D)||H2O2(l) ----> H2O(l) + 1/2 O2(g)|
Without consulting entropy tables, predict the sign of DS for the following process and choose the correct reasoning for your prediction: N2(g, 10 atm) ----> N2(g, 1 atm). The mass of N2 remains constant.
|A)||positive; there is an increase in the number of gas molecules.|
|B)||positive; the gas expands into a larger volume.|
|C)||negative; the gas is compressed into a smaller volume.|
|D)||negative; the gas expands into a larger volume.|
|E)||negative; there is a decrease in the number of gas molecules.|
Which of the following reactions will have the most positive DHo?
|A)||N2(g) ----> 2 N(g)|
|B)||F2(g) ----> 2 F(g)|
|C)||O2(g) ----> 2 O(g)|
|D)||These reactions would all have the same DHo.|
Rubidium has a heat of vaporization of 69.0 kJ/mol and an entropy of vaporization of 71.9 J/K.mol. Calculate the boiling point of rubidium.
Calculate DSorxn for the following reaction: 4 Cr(s) + 3 O2(g) ----> 2 Cr2O3(s).
For the process C6H6(l) ----> C6H6(s) at a temperature above the freezing point of C6H6,
|A)||DS is positive.|
|B)||DH is positive.|
|C)||DG is positive.|
|D)||DG = O.|
Keq = 7.0 at 35 oC for the reaction A + B ----> C + Calculate DGo for this reaction.
Sodium carbonate can be prepared by heating sodium bicarbonate. 2 NaHCO3(s)
----> Na2CO3(s) + CO2(g) + H2O(g). Given that DHo = 128.9 kJ and DSo = 321 J/K·mol for this reaction, at what temperature will K = 1?
Consider the reaction SO2(g) + NO2(g) ----> SO 3(g) + NO(g), which occurs at 298 K. Given the information below, determine which of the following choices is correct.
|A)||K > 1; DG > 0|
|B)||K > 1; DG < 0|
|C)||K < 0; DG > 0|
|D)||K < 0; DG < 0|
In the following reaction, SO2(g) + CuO(s) ----> Cu(s) + SO3(g), sulfur dioxide _____ reduce copper(II) oxide at 298 K.
|substance||DHof, (kJ/mol)||So, J/K·mol|
|A)||will; DGo is positive.|
|B)||will; DGo is negative.|
|C)||will not; DGo is positive.|
|D)||will not; DGo is negative.|
|E)||will not; DGo = 0.|