In which reaction is expansion work gained by the system? ►View Available Hint(s) O CaCO3(s)-CaO(s) + CO₂(g) OH₂(g) + Cl₂(g) -2HCl(g) OC₂H₂(g) + 2H2(g) -C2H6(9) NaCl(s) + AgNO3(s)-AgCl(s) + NaNO3(s)
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- Limestone stalactites and stalagmites are formed in caves by the following reaction:Ca2+(aq)+2HCO−3(aq)→CaCO3(s)+CO2(g)+H2O(l)Ca2+(aq)+2HCO3−(aq)→CaCO3(s)+CO2(g)+H2O(l)If 1 molmol of CaCO3CaCO3 forms at 298 KK under 1 atmatm pressure, the reaction performs 2.47 kJkJ of P−VP−V work, pushing back the atmosphere as the gaseous CO2CO2 forms. At the same time, 38.75 kJkJ of heat is absorbed from the environment. What is the value of ΔHΔH for this reaction? Express your answer using four significant figures.Automobiles and trucks pollute the air with NO. At 2000.0°C, Kc for the reactionN2(g)+O2(g)2NO(g)At 2000.0°C Kc = 4.100 × 10–4 and ΔH° = 180.6 kJ. What is the value of Kc at 41.00°C?Mg(s) + 1/2 O2(g) -> MgO(s). Determind the value of the standard enthalphy change for the reaction. Mg(s) + 2 HCI(aq) -> MgCl2(aq) + H2(g). ∆Hrxn = -316 kJ mol-1 MgO(s) + 2 HCI(aq) -> MgCl2(aq) + H2O. ∆Hrxn = -45.7 kJ mol-1 H2(g) + 1/2 O2(g) -> H2O. ∆Hrxn = -286 kJ mol-1
- To a test tube containing 10.0 ml of 0.50 M HCl solution in a calorimeter, 0.05482 g of solid MgO (MW = 40.30 g/mol) at the same temperature was added. A change in temperature of 6.2°C was recorded. In a separate experiment, the heat capacity of the calorimeter was determined to be 0.293 kJ/°C. 1. Calculate the experimental ΔHrxn (in kJ/mol) for the reaction between MgO andHCl.2. If the theoretical ΔHrxn of the reaction between MgO and HCl is -1349 kJ/mol, calculate the %error.21.7 g of a basic solution was mixed with 87.6 g of water in a calorimeter with a calorimeter constant of 47.6 J K–1 with all substances initially at 29.3 °C.The resulting solution was observed to be at a temperature of 15.4 °C and have a heat capacity of 4.39 J g–1 K–1.Determine q for the mixing process. a. 6670 J b. -1.37 × 105 J c. -7330 J d. -6670 J e. 7330 JCalculate the change in entropy in (J/K) when 470g of methanol (32 g/mol) is heated from 60 ⁰C to 70 ⁰C at constant pressure. Specific heat capacity of methanol at constant pressure is 81 J/mol-K.Answer Format: [2 decimals]
- 4. For which of the following processes ΔS is positive? Group of answer choices A, 2H2(g) + O2(g) → 2H2O (l) b, Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3 (aq) c, 4 NH3(g) + 5 O2(g) → 4 NO (g) + 6 H2O (g) d, CaO (s) + CO2 (g) → CaCO3(s) 5.For which of the following processes ΔS is positive? Group of answer choices A, Pb2+(aq) + I-(aq) → PbCl2 (s) b, H2SiF6 (aq) → 2HF (g) + SiF4(g) c, HCl (g) + NH3(g) → NH4Cl (s) d, 2 Mg (s) + O2(g) → 2 MgO (s)A sample of 0.165-mol perfect gas occupies 20.0 dm3 at 310 K initially. Process (1) The gas expands isothermally against a constant external pressure of 8.5 kPa until its volume becomes 50.0 dm3. Process (2) The gas expands isothermally and reversibly from 20.0 dm3 to 50.0 dm3 at 310 K. Which of the above processes does have a greater heat transaction (namely q)? Process (1) Process (2) Insufficient information. Same for Process (1) and Process (2)Reaction: Combustion of H2 with excess O2 mass = 2.4 g delta T = 1.2 oC heat capacity of bomb calorimeter = 12.1 kJ/ oC what is qrxn and delta Erxn?
- a chemist carefully measure the amount of heat needed to raise the temperature of a 0.60 kg sample of a pure substance from 47.3 c tp 53.3c. the experiment shows that 15. kj of heat are needed. what can the chemist report for the specific heat capacity of the substance? round to 2 sig figs.A system absorbs heat from the surroundings and no work is done on or by the system. What are the signs of qsystem and wsystem? Select the correct answer below: qsystem<0 and wsystem=0 qsystem>0 and wsystem=0 qsystem>0 and wsystem<0 qsystem<0 and wsystem<0The n-butane is converted into isobutane in an isomerization reactor, which operates isothermally at 149°C. Suppose that the reactor is fed with a mixture containing 93% mole of n-butane, 5% isobutane and 2% HCl at 149°C and that a 40% conversion of n-butane is achieved. How much heat in KJ/m3 (STP) of the feed, should be supplied or extracted from the reactor?