The standard enthalpy change of combustion [to CO2(g) and H2O()] at 25°C of the organic solid phthalic acid, C8H6O4(s), is determined to be -3209.0 kJ mol-1. What is the Hf° of C8H6O4(s) based on this value?  Use the following data: Hf° H2O () = -285.83 kJ mol-1 ;   Hf° CO2(g) = -393.51 kJ mol-1

pLEASE REFER TO THE ATTACHED PHOTO. THANK YOUUUUUU :)

please answer all the questions given in the picture.

10. The following molar enthalpies of formation are given in kJ/mol: AHP[C;Hs(g)] = -104; AHP[CO2(g)] = -394; AHP[H;O(g)] = -242. (a) Calculate the molar heat of combustion of propane (C;Hs) according to the following equation: C;Hs(g) + 5 O2(g) → 3CO2(g) + 4H2O(g); (b) How many grams of propane gas must be combusted to provide enough thermal energy to heat 1.00 kg water from 22.0°C to 100.0°C? (Specific heat of water = 4.184 J/mol.K)

Which of the following reactions occuring at 25° C defines the standard enthalpy of formation (TriangleHf) of liquid water? - 2 H (g) + O (g) -> H2O (l) - H2O(g) + O (g) -> H2O (l) - H2 (g) + ½O2 (g) -> H2O (l) - 2 H2 (g) + O2 (g) -> 2 H2O (l)

For the reactionP4O10(s) + 6 H2O(l)  4 H3PO4(aq)G° = -448.1 kJ and S° = -16.3 J/K at 310 K and 1 atm.This reaction is (reactant, product) _______  favored under standard conditions at 310 K.The standard enthalpy change for the reaction of 2.45 moles of P4O10(s) at this temperature would be ______ kJ.

Gasoline is composed primarily of hydrocarbons, includingmany with eight carbon atoms, called octanes. One ofthe cleanest–burning octanes is a compound called 2,3,4-trimethylpentane, which has the following structural formula: The complete combustion of one mole of this compoundto CO21g2 and H2O1g2 leads to ΔH° = -5064.9 kJ.(a) Write a balanced equation for the combustion of1 mol of C8H181l2. (b) By using the information inthis problem and data in Table 5.3, calculate ΔHf° for2,3,4-trimethylpentane.

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

Heat of reaction (AH°) for the following reaction at 25.0 °C is Fe;O4(6) + CO(g) 3FEO(s) + CO2(g) Given the following Heat of Formation: AHF0304(s) = (-1118 kJ/mol), AHCO(g) = (-110.5 kJ/mol), AHF«06) = (-272KJ/mol), AHco2(g) ( -393.5 kJ/mol),