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- You have a calorimeter with a heat capacity of 0.426 kJ/ºC. You combine 50.0 mL 1.50 M NaA (A- = conjugate base of weak acid HA) with an equal volume of HCl of higher molarilty. The temperature changes from 18.6 ºC to 21.1 ºC. What is ΔHºdissoc for the dissociation reaction of HA, in kJ?What is the heat of precipitation of barium sulphate if volume of both reactants sodium sulphate and barium nitrate was 50 cm3 and concentration was 1.0 moldm-3. Temperature increase were 5oC. c = 4.2J/KgKCalculate the Enthalpy of change in Kj/mol and % difference in the neutralization reaction below: HNO2 + NH3 = N2 + 2 H2O Initial Temp= 20 Deg celsius Final Temp= 22.3 Deg celsius Conc= 0.4 M [HNO3] and 0.4 M [NH3] Vol= 55 mL [HNO2] and 60 mL [NH3]= Mass is 115 g Specific Heat= 4.184 J/g For the other value in % difference use: -348 Kj/mol
- A 75.0 mL. of 2.00 MHCl(aq) at 22.0 oC is added to 150.0 mL. of 0.300 M NaOH(aq) at 22.000 oC. Then the reaction is proceeded and the final temperature is reached to 28.000 oC. Calculate the heat of reaction in kJ / mole. Hint: Treat this mixture as a diluted solution. CP of H2O(l) = 4.184 J / g oC D of H2O = 0.988 g/ mL. a. -37.3 kJ / moleb. -55.9 kJ/ molec. 124 kJ / moled. -124 kJ / moleWhat is the value of the equilibrium constant when ΔGorxn = 25 kJ·mol-1 and T=298 K?1. CaCO3(s) <--> CaO(s) + CO2(g) ΔH° = +178 kJ exo or endo - thermic remove mass(CaO) --> shift: __ (increase) P(CO2) shift? __ ... two ways to lose mass(CaCO3)? __________ higher T shift? __ 2. SO2(g) <--> (1/8)S8(s) + O2(g) ΔH° = +297 kJ exo or endo - thermic Δν(gas)= _, (increase)Vtot --> P(gas)_ > on _hs shift? __ (decrease)P(SO2) shift? __ ... two ways to make mass(S8)? ___________ lower T shift? __ 3. C(s) + 2H2(g) <--> CH4(g) ΔH° = –75 kJ exo or endo - thermic Δν(gas) = _, (decrease)Vtot -->P(gas)_ > on _hs shift? __ (increase)P(CH4) shift? __ ...two ways to to lose mass(C)? ___________ higher T shift? __
- Heterogeneous chemical reactionConsider the following reaction to form an industrially important solid product B:A (g) ↔ B (s) + C (g) + D (g)a) How many phases are present?b) What is the maximum amount of solid product B you can make for each mole of A fed to the reactorif the reactor is operating at 400 ºC and 1 bar. Data: K = 10.43 at 400 ºCDG0 = -67 kJ/mol for the reaction {2H2S(g) + SO2(g) ⇄ 3S(s) + 2H2O(g)} at 25 C. Find DG (in kJ/mol) for the same reaction when PH2S = 1´10-3 bar; PSO2 = 1´10-2 bar, PH2O(g) = 3´10-4 bar, and 2.31 grams of solid sulfur are at equilibrium at 25 C. (D is supposed to be a triangle)Calculate the AGrek value for the following reaction at 298K. CO (g) + 02 (g) - CO2 (g) Assuming that the AH°reak value is constant in the operating temperature range, calculate the AG value at 500K.
- 2NO(g) + Br2(g) ↔ 2NOBr(g) , initial concentration of NO is 0.0655mol and 0.0328mol of Br2 . At equilibrium concentration of NOBr is 0.0389mol. Calculate Kp , Kc at 500C˚and vessel volume?A student poured 100 ml of water (density = 1.00 g / mL) into a coffee calorimeter, noted that the temperature of the water was 18.8oC, then added 5.33 g KOH. With the lid on, the mixture was stirred, temperature increased and the maximum temperature reached at the time of mixing 31.6 oC. Calculate the heat of the system in this dissolution reaction (qsys). ( Approximate the specific heat capacity, cp as 4.18 J g-1 K-1. Do not consider the contribution to the heat generated from the calorimeter; assume that this is zero. Only calculate the heat from the heat capacity of the solution. make sure you consider the sign of qsys qsys for dissolution of KOH = JGiven the following standard enthalpies of hydration; Mg 2 + (g) + (ag) Mg2+(aq); A110 - 1920KJ C-n (g) + (aq) CT (a q) ; All 0 - 364 KJ- and using the value of AHO for the reaction a!ready given; calculate the standard enthalpy of solution of magnesium chloride.