Calculate the heat of formation of HCI(g) using the information below: CH4lg)+ 4 Cl2(g) → CCla(g) + 4 HCIG) AH°xn= -389 kJ/mol AH°F (kJ/mol) CHALS) -75 -96 Please do not include units in your answer.

26. Calculate the enthalpy change for the reaction below. NO(g) + O(g) →→→ NO₂(g) Given following data: NO(g) + O₂(g) →→ NO₂(g) + O₂(g) 03(g) → 1.50₂(g) 0₂(g) →20(g) AH-198.9 kJ AH = -142.3 kJ ΔΗ = 495.0 kJ

NW113AACE04-21 3. a hunk of metal-like substance was found in an archeological site. In an attempt to identify it, the metal was heated and placed in a calorimeter containing water and determined the specific heat of the metal. If the specific heat of the metal is 0.448 J/g °C, what is the approximate molar mass (atomic mass) and likely identity of the metal? (Hint: compare the molar mass (atomic mass) of metal that of metals in periodic table)

Use the following information to calculate the amount of heat involved in the complete reaction of 7.20 g of carbon to form PbCO3(s) in reaction 4. Be sure to give the proper sign (positive or negative) with your answer. Reaction 1 Pb(s) + O₂(g) PbO(s) Reaction 2 C(s,graphite) + O₂(g) →→→ CO₂(g) Reaction 3 PbCO3(s). PbO(s) + CO₂(g) Reaction 4 Pb(s) + C(s,graphite) + O₂(g) →→→ PbCO3(s) 1st attempt AH rxn4° = ? kJ AH rxnl AHO rxn2 AHO rxn3 AHXn4 = -219 kJ = - 394 kJ = 86 kJ = ? See Periodic Table See Hint

Given the following thermochemical equation, what is the standard heat of formation for NaOH? 2NaOH(s)-->2Na (s) + O2 (g) + H2 (g) TriangeH= +875.6 kJ a) 875.6 kJ b) -875.6 kJ c) 437.6 kJ d) -437.6 kJ e) 1751.1 kJ f) -1751.1 kJ

How much heat is produced when 0.480 mol of methane is burned under standard conditions. Enthalpy of combustion of methane = -891 kJ/mol. - A) -891 kJ B 428 kJ -222 kJ -644 kJ -428 kJ

Consider these reactions: Reaction 1: H2 (g) + Cl2 (g) → 2HC1(g) AH = -184.6 kJ Reaction 2: 20F2 (9) → 02 (9) + 2 F2 (9) AH= -49.4 kJ Reaction 3: N2 (g) + 202(g) → 2NO2(g) AH=+66.4 kJ Use Reaction 2. How much energy (in kJ) is released when 61.0 g of oxygen difluoride decomposes? Answer: - kJ (enter a positive value)