Question

use the following table for the reaction

C2H2 (g) + 5/2 O2 (g) = 2CO2 (g) + H2O (g)     delta H = -1255.5 KJ/mol

substance                   S (J. mol^-1. K^-1)

C2H2 (g)                      200.8

C2H4 (g)                      219.5

CO (g)                         197.6

CO2 (g)                       213.6

CO2 (aq)                     117.6

H2O (l)                        69.91

H2O (g)                        188.7

O2 (g)                           205.0

O (g)                           161.0

O3 (g)                           238.8

a. Use the data to calculate delta S in J/K for this reaction

b. Calculate delta G in KJ , since the reaction is ................... (positive/ negative) the reaction is spontaneous at 25 C

c. The reaction becomes more spontaneous at ........................ (higher/ lower) temperatures and less spontaneous at ........... (higher/lower) temperatures. This reaction is nonspontantaneous at ........................... (at very high temperature/ at very low temperature/ under no circumstances).

d. Do you think you could use the equation, delta G = delta H -T delta S, to calculate such temperature range? There is ............... (some/ no) error in using this equation since delta H and delta S terms are for reaction under standard state conditions and the combustion of acetylene in torches occurs at a temperature ...................... (much greater than/ much less than/ about equal to) the standard temperature 25 C