produce carhon dioside At what temperature will this reaction be spontaneous acc
ID: 571505 • Letter: P
Question
produce carhon dioside At what temperature will this reaction be spontaneous according to Oibbr's Enery? 1According to the Second Law of Thermodynamics, the entropy of the universe must for a spontaneous process? AS in J/mol K for:CO)-1976,CO)-213.6,04) 205.0 a. increase b. remain the same c. decrease C b-temps below 179.5 K e. temps above 415.8 K d temps below 3273 K 2. Calculate G for the reaction: G in kimol for: song)--300.2, soug)--371.1 a.-70.9 b. +141.8 6. The randomness of a system may be described as its C a Gibb's energy C b. entropy c. kinetic energy C d. enthalpy C d. +70.S 7.Two 6.5 L flasks are joined by a 150 ml. tube with a stop cock. If 0.25 moles of nitrogen are held in the left flask and the right flask is empty, what happens to the entropy of the system upon opening the valve between the flasks? 3. Calculate AS for the reaction: S in Mnol K for: Nodg)-240.0, Ni(g)-191.5, 04)- 205.0 C a. The entropy remains the same. b. The entropy decreases. C. There is too little information to assess the change. a. +157 J/K b.-480 J/K c. +108 J/K C d.-157 JK d. The entropy increases 8. Without detailed calculations, predict the sign of AS for the system for 4. Consider the combustion of glucose (CH O.). This reaction is: Mg(s) + O2(g) MgO(s) a. positive (+ b. too little information to assess the change a. non-spontaneous at all temperatures b. non-spontancous towards lower temperatures c. negative () c.spontaneous at all temperatures d. spontaneous towards higher temperatures d. zero 9. All reactions with a positive AS are spontaneousExplanation / Answer
Q1
2nd law --> states that chaos increase for spontaneous processes
therefore
entropy must INCREASE
Q2
dG = dGproducts - Greactants
dG = 2*SO2 + O2 - 2SO3
dG = (2*-300.2) -2*-371.1 = 141.8
this is endothermic
choose B
Q3
d S= Sprodc - Sreact
dS = 2N2 + O2 - 2NO2
dS = 2*191.5 + 205 - 2*240
dS = 108 J/K
Q4
combustino is spontaneous at any T, since it can oxidize at any moment
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