University:
Bradley University
Course:
CHM 100 | Fundamentals of General Chemistry
Academic year:

2023
Views:

130

Pages:

2
Author:

eishuma5iuk

NSM 12C PAL Worksheet Reaction Enthalpy Name: _____________ 1. Sodium metal reacts with water to produce hydrogen gas and sodium hydroxide. When 0.575 g of sodium is added to 100.00 g of water, the temperature of the resulting solutions rises from 25.00 C° to 35.75 C°. If the specific heat of the solution is 4.18 J/(g ∙ C°), calculate ΔH for the reaction, in kJ/mol. 2. According to the following thermochemical equation, what mass of H2O (in g) must form in order to produce 975 kJ of energy? SiO2(s) + 4 HF(g) → SiF4(g) + 2 H2O(l) ΔH°rxn = − 184 kJ 3. Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: 2 S(s) + 3 O2(g) → 2 SO3(g) ΔH°rxn = ? Given: (1) SO2(g) → S(s) + O2(g) ΔH°(1) = +296.8 kJ (2) 2 SO2(g) + O2(g) → 2 SO3(g) ΔH°(2) = −197.8 kJ 4. Compute ΔH° in kJ for 2 LiH(s) + O2(g) → Li2O(s) + H2O(l) (1) 2 LiOH(s) → Li2O(s) + H2O(l) ΔH(1)° = 379.1 kJ (2) LiH(s) + H2O(l) → LiOH(s) + H2(g) ΔH(2)° = −111.0 kJ (3) 2 H2(g) + O2(g) → 2 H2O(l) ΔH(3)° = −285.9 kJ 5. Given the heat of formation of the following compounds: CO2(g) ΔH°f = -‐393.5 kJ/mol H2O(l) ΔH°f = -‐285.9 kJ/mol CH3OH(l) ΔH°f = -‐238.6 kJ/mol What is the value of the ΔH for combustion of one mole of methanol, CH3OH(l)? 6. Sulfur dioxide reacts with oxygen to form sulfur trioxide. Use the ΔH°f and ΔH°rxn information provided to calculate ΔH°f for SO3(g): 2 SO2(g) + O2(g) à 2 SO3(g) ΔH°rxn = -‐198 kJ ΔH°f SO2(g) = -‐297 kJ/mol 7. Write the chemical equation for the reaction that describes the formation of ammonium bromide at standard state conditions.