Chapter 18 Thermodynamics Homework 1.Predict the sign of AS for each process: a) The boiling of water b)2HgO(s)-2Hg(I) + 02(s) c) CaCO, (s)CaO(s)+ CO (g) 2. Is the following process spontaneous or nonspontaneous at a given temperature? NaNO,(s) ->NaNO,(aq) 3. If a reaction has ΔS < 0 and ΔΗ < 0 will the reaction always be spontaneous, spontaneous at low T, spontaneous at high T, or never spontaneous? 4.Consider this reaction: Calculate ΔG at 25 °C and determine whether the...
Predict the sign and calculate ASⓇ for a reaction. Consider the reaction 2H S(g) + 302(g) +2H2O(g) + 25029) Based upon the stoichiometry of the reaction the sign of Srce should be Using standard thermodynamic data (in the Chemistry References), calculate AS rx at 25°C. AS J/Kºmol Predict the sign and calculate ASº for a reaction. Consider the reaction 2H,S(g) + 302(g)— 2H2O(g) + 250 (9) Based upon the stoichiometry of the reaction the sign of AS rx should be...
Predict the sign of AS for each of these changes. a) O2 (g) → O2 (aq) b) C.H. (8) → C.H. (1) - c) C(s) + CO2(g) → 2 CO (g) d) C12H22011 (8) ► 12H2011 (aq) e) 2 NO2(g) → N.04 (g) 2) Indicate the correct type of process for the following: Process Spontaneous Non-Spontaneous 1. Melting of ice cubes at -5°C and 1 atm pressure 2. Dissolution of sugar in a cup of hot coffee 3. Reaction of...
4. Given the data in the table, determine: Hf for FeO(s) Hrxn O for FeO(s) +2H+H201)+ Fe2+ Reaction Hrxn ° (J) Fe(s) +2H+H2 (g) +Fezt 2Fe (s) +3/2 02 (g) Fe20s (s) 2FeO (s)+h 02 (g) Fe203 (s) H2 (g +02 (g) H20 (1) - 86,200 -822,200 284,000 -285,840
4. Given the data in the table, determine: Hf for FeO(s) Hrxn O for FeO(s) +2H+H201)+ Fe2+ Reaction Hrxn ° (J) Fe(s) +2H+H2 (g) +Fezt 2Fe (s) +3/2 02 (g) Fe20s...
Calculate ∆H for the reaction 2 C(s)+H2( g)→C2H2( g), given the following information: C2H2(g)+5/2 O2(g)→2 CO2(g)+H2O(l) ∆H=-1299.6kJ C(s) + O2( g)→CO2( g) ∆H= -393.5 kJ H2( g)+1/2 O2( g)→H2O (l) ∆H= -285.8 kJ
Consider the following reaction: C 2H 2( g) + 2H 2( g) C 2H 6( g) Δ H° rxn = –311 kJ Under which conditions would the product yield be at a maximum? A. high temperature, high pressure B. low temperature, high pressure C. high temperature, low pressure D. low temperature, low pressure \E. none of the above, unless a catalyst is present
12) Predict the sign of AS of the system for both of the following. I. 2 C(graphite) + O2(8) - 2 CO(8) II. C6H14(8) - C6H14(1) A) AS should be positive for I and positive for II. B) AS should be negative for I and positive for II. C) AS should be positive for I and negative for II. D) AS should be negative for I and negative for II. 13) If Q increases, A) AG increases and the reaction...
3. Predict the sign (positive or negative) on the entropy change for each of these reactions. (a) 2 SO2 (g) + O2 (g) → 2 SO3 (g) Negative (b) 2 NH3 (g) → N2 (g) + 3 H2 (g) (c) CO (g) + 2 H2 (g) → CH3OH (1) 4. For the reaction: 2NO2 (g) + N204 (g) at 298 K, The value of AH° and AS™ are -58.03 kJ and -176.6J/K, respectively. (a) What is the value of AG°...
Thermodynamics Practice Problems 1. Predict the sign of AS.(positive or negative) for the following reactions a 2 Mg(s) +,(@) 2 Mgo (s) AS b. CH206(s) → 2C,H,OH(I) + 2003(g) AS c. 2 NH3(g) + CO2(g) → H2O(l) + NH CONH3(aq) AS d. Cu(s) (at 100°C) → Cu(s) (at 25°C) AS 2. Which two variables can indicate if a reaction is spontaneous or not? 3. The second law of thermodynamics tells us that: a Energy is conserved. b. The entropy of...
Predict the sign of as in the system for each of the following reaction Circle appropriate sign: a) PCI_5 (s) - PCI-3 (I) + CI_2(g) b) Mg(s)+CI2(g) - MgCI_2(s) AS: + or - c) l_2(g) - CI_2 (g) d) H_20(g) H_20 (I) 2) Assuming that gaseous reactants and products are present at 1 atm and dissolved reactants and products are present at 1M, which of the following reactions are nonspontaneous in the forward direction?