4. The complete combustion of liquid benzene is represented by the equation: CH6(1) + 7½O2(g) = 6CO2(g) + 3H;O(I) Using the data below, calculate, for this reaction CH6(1) Substance: O2(g) CO2(g) H,O(I) AH°; (kJ/mol): S'(J/mol-K): a) AH° 49 -394 -286 173 205 214 70 b) AS° c) AG° at 25°C.

14 Write the thermochemical equation for the combustion of liquid butane (C.H10). AH C,H10 0= -147.6 CO2 ( = -393.5 H,O (s) = kJ H.C -241.8 (3)

Use your table of Heats of Formation to calculate the heat of reaction for the following reaction: C2H4(g)  +  3O2(g)  ⟶   2CO2(g)  + 2H2O(g)

18. Calculate the heat of reaction at constant volume for 5.00 g C3H8 ,considering the following chemical reaction: C3H8 (g) + O2(g) --------------------> CO2 (g) + H2O (g) heat of standard formation:  O2 = 0.00  kJ / mole,  H2O (g) = -245 kJ / mole,   CO2 = -318 kJ/mole  and  C3H8  = -438 kJ / mole C3H8 = 44.09 g/mole  Temperature is 33 oC a. -789 kJ b. -212 kJ c. 412 kJ d. -169 kJ

In a coffee cup calorimeter, 10.0mL of 1.00M AgNo3 and 10.0mLof 1.00M NaCl are mixed and the following reaction occurs (assume reaction goes to completion) Ag+ (aq) + Cl-(aq) ----> AgCl(s) The 2 solutions are intitially at 25.0C and the final temperature is 36.2C. Assuming density of the solution is 1.00g/mL and the heat capactity of the solution is 4.18J/K/g. Calculate q for the reaction in KJ

3 C2H2(g) → CHo(g) What is the standard enthalphy change AH°, for the reaction represented above? (AH®7of C2H2(g) is 230 kJ mol-1; (AH®5of €CGH6(g) is 83 kJ mol-1:) (A) -607 kJ (B) -147 kJ (C) (C) -19 kJ (D) +19 kJ (E) +773 kJ

4. What mass of propane must be burned to supply 700. kJ as heat? The thermochemical equation for the combustion of propane is: C3H8(g) + 5 O2(g) → 3 CO2(g) + 4H₂O(1) AH°-2220. kJ