1. For a given chemical process, the system releases 226 kJ of
heat and the surroundings perform 233 kJ of work on the system.
What is the value of ΔU (in kJ) for the process? Report your answer
to three significant figures.
2. Calculate the standard enthalpy change, ΔH°rxn, in kJ for the
following chemical equation, using only the thermochemical
equations below:
2CaO(s) + 2CO2(g) → 2CaCO3(s). Report your
answer to three significant figures in scientific
notation.
Equations: | ΔH°rxn (kJ) | |
Ca(s) + CO2(g) + 1/2O2(g) → CaCO3(s) | -812.5 | |
2Ca(s) + O2(g) → 2CaO(s) | -1270.3 | |
1. For a given chemical process, the system releases 226 kJ of heat and the surroundings...
Calculate the standard enthalpy change, ΔH°rxn, in kJ for the following chemical equation, using only the thermochemical equations below: CaCO3(s) → CaO(s) + CO2(g) Report your answer to three significant figures in scientific notation. Equations: ΔH°rxn (kJ) Ca(s) + CO2(g) + 1/2O2(g) → CaCO3(s) -812.5 2Ca(s) + O2(g) → 2CaO(s) -1270.3
Calculate the standard enthalpy change, ΔH°rxn, in kJ for the following chemical equation, using only the thermochemical equations below: 2COBr2(g) + 4NO(g) → 4NOBr(g) + 2CO(g) Report your answer to three significant figures in scientific notation. Equations: ΔH°rxn (kJ) CO(g) + Br2(g) → COBr2(g) -3 1/2N2(g) + 1/2O2(g) → NO(g) 90.4 1/2N2(g) + 1/2O2(g) + 1/2Br2(g) → NOBr(g) 82.1
2Ca(s)+O2(g) → 2CaO(s) ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K For this problem, assume that all reactants and products are in their standard states. Calculate the free energy change for the reaction at 17 ∘C. Express your answer using four significant figures. ΔG = _____kJ
Consider the following reaction: 2Ca(s)+O2(g) → 2CaO(s) ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K Assume that all reactants and products are in their standard states. Calculate the free energy change for the reaction at 34 ∘C. Express your answer using four significant figures.
2Ca(s)+O2(g) → 2CaO(s) ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K For this problem, assume that all reactants and products are in their standard states. Calculate the free energy change for the reaction at 29 ∘C. Express your answer using four significant figures. Part A ΔG = ______ kJ Part B Is the reaction spontaneous? spontaneous OR nonspontaneous
Calculate ΔE, if a system releases 66.3 kJof heat to its surroundings while the surroundings do 43.0 kJ of work on the system. Express your answer using two significant figures. ΔEΔE =____________ kJ
2Ca(s)+O2(g) → 2CaO(s) ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K You may want to reference (Pages 706 - 709) section 17.5 while completing this problem. Part A Calculate the free energy change for the reaction at 15 ∘C. Express your answer using four significant figures.
Answer both question below. Show all work and chemical equations. 1. Using the information below answer questions a to c. Ca sº = 41.6 J/mol K CaCO3 (s) sº = 91.7 J/mol K AH° = -1207.6 kJ/mol O2 Sº = 205.2 J/mol K Cao (s) S0 = 38.1 J/mol K AH = -634.9 kJ/mol CO2 (g) sº = 213.8 J/mol K AH° = -393.5 kJ/mol AH° O2 = 0 kJ/mol AH° Ca= 0 kJ/mol a) Calculate AS9rxn and AH°rxn for...
Heat, q, is energy transferred between a system and its surroundings. For a process that involves a temperature change q=m⋅Cs⋅ΔT where Cs is specific heat and m is mass. Heat can also be transferred at a constant temperature when there is a change in state. For a process that involves a phase change q=n⋅ΔH where, n is the number of moles and ΔH is the enthalpy of fusion, vaporization, or sublimation. The following table provides the specific heat and enthalpy...
1. A system releases 654 kJ of heat and does 140 kJ of work on the surroundings. What is the change in internal energy of the system? 2. How much heat is required to warm 1.30 L of water from 26.0 ∘C to 100.0 ∘C? (Assume a density of 1.0g/mL for the water.) Express your answer using two significant figures..