From the following information, determine ΔH°f of malonic acid, CH2(COOH)2(s). CH2(COOH)2(s) + 2O2(g) → 3CO2(g) + 2H2O(l); ΔH° = –861.0 kJ Substance ΔH°f (kJ/mol) CO2(g) –393.5 H2O(l) –285.8 a. 2613 kJ b. 891.1 kJ c. −1540.3 kJ d. −2613.1 kJ e. −891.1 kJ

ΔH° f (kJ/mol) SO 2Cl 2( g) + 2 H 2O( l) → 2 HCl( g) + H 2SO4( l) ΔH° rxn = ? SO 2Cl 2( g) -364H 2O( l) -286HCl( g) -192H 2SO 4( l) +314

Use the information provided to determine ΔH°rxn for the following reaction:   ΔH°f (kJ/mol)              2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g)      ΔH°rxn = ?   C2H2          227   CO2(g)       -394   H2O(g)        -242  answers: + 2510 kJ -1130 kJ + 710 kJ -710 kJ -2510 kJ

Choose the correct ΔH0reaction for the reaction: 4 NH3(g) + 5 O2(g) → 4 NO(g) +  6 H2O(g) Compound ΔH0f (kJ/mol reaction) NH3(g) -46.0 NO(g) +90.0 H2O(g) -242 A) -908 kJ/mol reactions  B) -106 kJ/mol reactions C) +106 kJ/mol reactions D) -152 kJ/mol reactions E) +908 kJ/mol reactions F) +152 kJ/mol reactions

Given the following thermochemical equations, find ΔH° for the following reaction: 2NH3(g) + 2O2(g) ⟶ N2O(g) + 3H2O(l)                               ΔH˚ = ?   2NH3(g) + 4SO3(g) ⟶ N2O(g) + 4SO2(g) + 3H2O(l)            ΔH˚ = -290 kJ 2SO3(g) ⟶ 2SO2(g) + O2(g)                                                  ΔH˚ = 197 kJ

Given the following data: N2(g) + O2(g) → 2NO(g) ΔH = +180.6 kJ 2CO2(g) + N2(g) → 2CO(g) + 2NO(g) ΔH = 746.6 kJ Find the ΔH of the following reaction: 2CO2(g) → 2CO(g) + O2(g)

Find ΔHrxnΔHrxn for the reaction: C(s)+2H2(g)→CH4(g)C(s)+2H2(g)→CH4(g) Use these reactions with known ΔHΔH's: CH4(g)+2O2(g)C(s)+O2(g) 2H2(g)+O2(g)→→→ CO2(g)+2H2O(g)CO2(g) 2H2O(g)ΔH=−892kJΔH=−393.6kJΔH=−483.6kJ

Suppose 9.44 g of calcium chloride, CaCl2, (MM=111.0 g/mol) is added to 222. g water at 21.84oC in a styrofoam cup calorimeter, and the temperature rose to 29.76oC.  Calculate a value for ΔH  in the equation:  CaCl2(s) + H2O(l) → Ca2+(aq) + 2Cl-(aq)    ΔH = ??? kJ/mol. (Assume that the styrofoam cup does not absorb any heat nor allow any heat loss; assume the specific heat of the resulting solution is 3.88 J/(goC))

When a 25.0 g sample of AgNO3 dissolves in 100.0 g of water in a calorimeter, the temperature drops from 22.3 °C to 15.9 °C.  Calculate ΔH for the process:  AgNO3(s) → Ag+(aq) + NO3 -(aq)  c = 4.184 J/g∘C

If a given reaction is A + B --> 2C with ΔH = 123.4 kJ and the needed reaction is 2A + 2B --> 4C, what is the ΔH for the needed reaction?