Determine if the synthesis of sulfuric acid is a spontaneous reaction at 25°C. Chemical Equation: S + O2 + H2O → H2SO4 1. Compute for the ΔH° rxn of the equation: ___________kJ/mol (Write your answer in whole number without the unit). Compound ΔH° (kJ/mol) ΔS° (J/K•mol) S  0 31.88 H2O –285.8 69.9 O2 0 205 H2SO4 –811.3 156.9

MISSED THIS? Watch IWE: Standard Enthalpies of Formation; Read Section 7.9. You can click on the Review link to access the section in your eText. Consider the table of Standard Thermodynamic Quantities for Selected Substances at 25 °C. Substance AH; (kJ/mol) Substance AH; (kJ/mol) Substance AH; (kJ/mol) Al(g) HCl(aq) NF₂ (g) Al₂O₂ (s) Cr(g) NH:(E) F(g) C(g) CH₂(g) C₂H₂(g) C₂H₂(g) C₂H6(g) CO(g) CO₂ (g) Cl(g) HCl(g) 330.0 -1675.7 716.7 -74.6 227.4 52.4 -84.68 -110.5 -393.5 121.3 -92.3 HF(g) HF (aq) H(g) Fe(g) FeO(s) Fe₂O₂ (s) Fe₂O4(s) N(g) -167.2 396.6 79.38 -273.3 -335.0 218.0 416.3 -272.0 -824.2 -1118.4 472.7 NH3(aq) O(g) O₂(g) S(g) SO₂(g) SO3(g) Sn(g) SnO(s) SnO₂ (s) -132.1 -45.9 -80.29 249.2 142.7 277.2 -296.8 -395.7 301.2 -280.7 -577.6 Part A Enter an equation for the formation of HF(g) from its elements in their standard states. Express your answer as a chemical equation including phases. Part C ΑΣΦ 6 A chemical reaction does not occur for this question. Part B Complete previous…

C4H10 (g) + 6.5 O2 (g)—>4 CO2 (g) + 5H2O (g) •Jot down the correct values of ΔH below the substance • Multiply by the number of moles • Note that number down below each substance . •Add the values of the products and the reactants separately. • Σ nΔH0prod - Σ nΔH0react

1.) Complete A and B to move on. a.) Write the complete, balanced chemical equation for the following reaction on a separate sheet of paper. Provide products where they are not given. Assume that the reaction is spontaneous. Propane (C3H8) + oxygen → carbon dioxide + water Type the sum of the coefficients in the equation into the answer blank.  If there is no coefficient, count it as one. Include ( g, s, l, or aq) b.) Write the complete, balanced chemical equation for the following reaction on a separate sheet of paper. Provide products where they are not given. Assume that the reaction is spontaneous. Diphosphorus pentoxide + water → Type in the coefficient and formula for the product in the equation that contains phosphorus. Include ( g, s, l, or aq)

3. Calculate the value of ΔSo for the formation of POCl3 from its constituent elements, as shown below. P2(g) + O2(g) + 3Cl2(g) → 2POCl3(g)

For a particular reaction at 150.5 °C, AG = –392.62 kJ/mol, and AS = 692.39 J/(mol · K). Calculate AG for this reaction at -0.4 °C. - AG = kJ/mol 80 DII DD F3 F4 F7 FB F9 F10 F12 %24 & 4. 5 6 7 8 Y U H K F.

Calculate AS°rxn for the following reaction. The S° for each species is shown below the reaction. N2H4(l) + H2(g) → 2 NH3(g) ings S°(J/(mol·K)) 121.2 130.7 192.8 O -59.1 J/K es O 311.0 J/K O 133.7 J/K O -133.7 J/K O 637.5 J/K

Consider the reaction A → B with ΔS° = 78.900 J/(K·molrxn). What should be the ΔS° in J/(K·molrxn) for the reaction B → A? Report your answer to three decimal places.

25°C 32°C bum wohl 891 10 228 1. Two aqueous reactants are mixed in a flask with a balloon over the top and the following change is observed. What are the signs on q and w for the system? Enter >, <, or in each box below. W 0 2. You drop a piece of potassium metal into water and the following exothermic reaction occurs: 2 K(s) + 2 H₂O(l) → 2 KOH(aq) + H₂(g) What are the signs on q and w for this reaction, at constant temperature and pressure? A) q is positive and w is negative. B) q is negative and w is positive. C) q and w are both negative. D) q and w are both positive. E) There is not enough information given. 3. What is the change in internal energy when one mole of helium gas in a flexible-walled container at STP is heated to 100°C? (CHe(g) = 5.30 J/g°C) AU =

The standard state Gibb's energy and entropy changes are known for the reaction: 2H, S(g) + 30,(g)=2H20(g) + 2SO2(g) What is the standard state enthalpy change for the reaction at 25 C? 120 kJ 52 J AGº ASº Mole Mole K -68 kJ/mol 154 kJ/mol 104 kJ/mol O -119 kJ/mol