1. What is 4,H for this reaction: 3C(s) + 4H2(g) → C3H8(g) given the following reactions: C3H8(g) +502(g) → 3CO2(g) + 4H2O(g) C(s) + O2(g) → CO₂(g) 4-H = -2043 kJ/mol 4,H=-393.5 kJ/mol 4,H= -483.6 kJ/mol 2H₂(g) + O₂(g) → 2H₂O(g) (a) -4191 kJ/mol (b) 1166 kJ/mol (c) 378 kJ/mol (d) -105 kJ/mol

Consider the following reaction.  CH4 + 2O2 -> 2H2O + CO2      ΔH = -890 kJ/mol If 45 g of methane combust, then what amount of energy is released?

3.

The heat of reaction for the combustion of benzene (C6H6) is –3909.9 kJ. 2 C6H6 15 O2 → 12 CO2 + 6 H20 What would be the heat change when 161.54 g of benzene is burned in kilojoules?

3

For the reaction: 2 CH3OH) +3 02(g) (1) → 2 CO2 + 4 H20u) + 4 H200 + 347 kcal Calculate the amount of heat in kcal & kJ released when 25.4 g of CH,OH reacts.

Consider these reactions: Reaction 1: H2(g) + Cl2(g) 2HCl(9) AH = -184.6 kJ Reaction 2: 20F2(g) → O2(g) +2F2(g) AH=-49.4 kJ Reaction 3: Na (g) +202 (9) 2NO2(g) AH = +66.4 kJ Use Reaction 1. Determine the mass, in grams, of chlorine gas consumed (with excess H₂) when 1,409.0 kJ of energy is released from the system. Round to the nearest whole number .

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)

Consider these reactions: Reaction 1: H₂(g) + Cl₂ (g) Reaction 2: 20F2 (g) O2(g) +2 F2 (g) AH Reaction 3: N₂(g) + 2O2(g) → 2NO₂(g) AH = +66.4 kJ Use Reaction 1. — → 2HCl(g) AH = -184.6 kJ g = -49.4 kJ Determine the mass, in grams, of chlorine gas consumed (with excess H₂) when 1,959.0 kJ of energy is released from the system. Round to the nearest whole number. Answer:

Using the equations - N₂(g) + O₂(g) → 2 NO (g) AH° = 180.6 kJ/mol N₂(g) + 3 H₂ (g) → 2 NH, (g) AH = -91.8 kJ/mol 2 H₂ (g) + O₂(g) → 2 H₂O (g) AH = -483.7 kJ/mol 2 Determine the molar enthalpy (in kJ/mol) for the reaction 4 NH, (g) + 5 O₂ (g) →4 NO (g) + 6 H₂O (g).