2. The enthalpies of the following reactions can be measured. CH, (g) + 302 (8) 200,...
1. The enthalpies of the following reactions can be measured. CH, (g) + 20, (g) CO2(g) + 2H,0 (g) AH = -802.4 kJ CH,OH (g) +/, 0, (g) CO2(g) + 2H,0 (g) AH = -676 kJ Use these values and Hess's law to determine the enthalpy change for the reaction CH, (g) +'/20 (8) CH,OH(g)
21 Use Hess's Law to calculate the enthalpy change for the reaction: Wo3(s)+3H2(g)-W(s)+3H20(g) Eqn 1: 2W(s)302(g) 2WO3(s) AH -1685.4 kJ/mol Eqn 2: 2H2(g) O2(g)2H20(g) AH -477.84 kJ/mol Give your answer as just a number without the assumed units (kJ/mol)
Determine the enthalpy change for CS20 + 302(g) + CO2(g) + 2SO2(g); AH= ? using the following three thermochemical equations, which will be referred to as reactions (A), (B), and (C). (A) 2C(s) + 202(g) 2002(g); AH= -787.0 kJ (B) C(s) + 25(s) → CS2(); AH= 87.9 kJ (C) SO2(g) → S(s) + O2(g); AH= 296.8 kJ 1. The enthalpy change for the unknown reaction is 2. Describe the action performed on each thermochemical reaction. Reaction (A) was Reaction (B)...
4. From the following experimental data: 11: (g) + '0(g) → H2O (1) 3SO: (g) + 3H20 (1) ► 3H2SO4 (1) 250; (g) → 28 (s) + 302(g) AHºrx = -285.8 kJ/mole AH = -264.27 kJ/mole AHºrn = -791.4 kJ/mole (a) (b) (c) Calculate the standard enthalpy of formation for H2SO4 (1) using the three equations above and Hess's Law. Be sure to SHOW ALL WORK! Including the combination of the equations and the combination of the enthalpies. Hint: write...
Why do we divide enthalpies in the first problem but multiply enthalpies in the second problem. What is different about these two problems that we have to use a different tactic to find the enthalpy of the third equation. 5. Use Hess's law to calculate the enthalpy change for the reaction 3PICL given that 2Hg)0(82H0() 302(g)203(g) AH-483.6k AH 284.6 k 699 →
Consider the two reactions. 2 NH3(g) + 3N2O(g) + 4N2(g) + 3H2O(1) 4 NH3(g) + 302(g) + 2N2(g) + 6H2O(1) AH° = -1010 kJ AH° = 1531 kJ Using these two reactions, calculate and enter the enthalpy change for the reaction below. N,(8) + O2(8) + N20(8) AH° = k.
13. Consider the following equation 2C(s) + 2 H20 (g) CH, (g) + CO2(g) Determine the standard enthalpy change for this reaction from the following standard enthalpies of reaction : (1) C(s) + H2O (g) CO(g) + H, (g) AH° - 131.3 kJ (2) CO(g) + H2O (g) CO2(g) + H2(g) AH° - -41.2 kJ (3) CH, (g) + H,0(g) 3H, (g) + CO(g) AH° - 206.1 kJ A 15.3 B. -116.1 C. 378.2 D. -427.0
Calculate the enthalpy of the reaction 2NO(g) + O2(g)2NO2(g) Hess's law states that "the heat released or absorbed in a chemical process is the same whether the process takes place in one or in several steps." It is important to recall the following rules: given the following reactions and enthalpies of formation: 1. ¢ N2(g) + O2(g)+NO2(g), AH; = 33.2 kJ 2. N2(g) + O2(g) NO(g), AHB = 90.2 kJ 1. When two reactions are added, their enthalpy values are...
Part A Use standard enthalpies of formation to calculate AH, for the following reaction: CH,OH(1) + 302(g) 2002(g) + 3 Express your answer using four significant figures. IVO ALOO ? AH...= Submit Request Answer Part B Use standard enthalpies of formation to calculate AH.for the following reaction CH,(g) + 202(g) –CO2(g) + 2H2C Express your answer using three significant figures. GOAL Oa? AH...= Submit Request Answer
4. (3 points) Consider the following enthalpies of reaction: CaCz(s) + 2H20 (Ca(OH)2(s) + CH2(g) AH,º=-127.9 kJ/mol Cas) + 1/20 (g) - Cao(s) AH,º=-635.1 kJ/mol Cal(s) + H200 - Ca(OH) (9) AH,=-65.2 kJ/mol The standard enthalpies of combustion of graphite and C2H2(g) are -393.51 and -1299.58 kJ/mol, respectively. Calculate the standard enthalpy of formation of CaCz(s) at 25°C. Aside on enthalpy of combustion: Please note that the standard enthalpy of combustion will form H200, not H:09), if the substance includes...