The value of ΔH for the following reaction is +52.0 kJ/mol at 298K. What is the value of ΔU in kJ/mol at the same temperature? 6C(s) + 3H2(g) --> C6H6(l)
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The value of ΔH for the following reaction is +52.0 kJ/mol at 298K. What is the value of ΔU in kJ/mol at the same temperature?
6C(s) + 3H2(g) --> C6H6(l)
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- A metal sample weighing 51.0 g and at a temperature of 100.0 oC was placed in 38.8 g of water at 25.3oC. At equilibrium the final temperature of the water and metal was 33.2oC.a. What was the change in temperature for the water?oC b. What was the temperature change for the metal?oC c. Taking the specific heat of water to be 4.184J/goC,caculate the specific heat of the metal.J/goC d. What is the approximate molar mass of the metal? g/molA 382−g aluminum engine part at an initial temperature of 18.76C absorbs 97.3 kJ of heat. What is the final temperature of the part (c of Al = 0.900 J/gK)?A 0.500g sample of KCI is added to 50.0g of water in a calorimeter. If the temperature decreases by 1.05 degrees C, what is the approximate amount of heat involved in the dissolution of the KCI, assuming the specific heat of the resulting solution is 4.18 J/g C? Answer in joules
- At constant pressure and 25°C, what is ΔH° for the following reaction2C2H6(g) + 7O2(g) → 4CO2(g) + H2O(l)if the complete consumption of 38.2 g of C2H6 liberates 1981 kJ of heat energy?a. 3120 kJb. 1560 kJc. 5030 kJd. 2510 kJe. 784.05 kJWhich of the following processes has ΔS<0? Select one: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) 1.0 L of He(g) is compressed to 500 mL. Milk is added to a cup of coffee. H2O(s) → H2O(l) CaCl2(s) → Ca2+(aq) + 2Cl–(aq)When 18.5 g of HgO(s) is decomposed to form Hg(l) and O2(g), 7.75 kJ of heat is absorbed at standard-state conditions. What is the standard enthalpy of formation (ΔH°f) of HgO(s)? -the answer is -90.7kJ/mol, what's the solution?
- (a) How much heat is released when 25.0 g of methaneburns in excess O₂ to form gaseous CO₂ and H₂O?(b) Calculate the temperature of the product mixture if themethane and air are both at an initial temperature of 0.0C.Assume a stoichiometric ratio of methane to oxygen from theair, with air being 21% O₂ by volume (c of CO₂=57.2 J/molK;c of H₂O(g)= 36.0 J/molK; c of N=230.5 J/molK).In the chemical reaction below, 200 kJ of heat was released.:2A₍ₛ₎ + 3B₍ₗ₎ → 2C₍ₛ₎ + 3D₍ₗ₎Determine the heat of formation at standard state in kJ/mol of C if:A₍ₛ₎ = 250 kJ/molB₍ₗ₎ = -200 kJ/molD₍ₗ₎ = 550 kJ/molconsider the following balancing process at 700c 2H2 (g) + 2s2 (g) 《》 2H2 (g) An analysis shows that there are 2.5 moles of H2, 135 × 10 ^ -5 moles of S2 and 8.70 moles of H2S contained in a 12-liter flask calculating Kc and Kp
- When solid ammonium nitrate (NH4NO3) dissolves in water, the process is endothermic, with ΔHsolution = +25.69 kJ/mol . (This reaction has been used in commercial cold packs.)If 5.60 g NH4NO3 is dissolved in 100.0 g of water at 22.0° C, what is the final temperature of the solution? The total mass of the solution is 105.6 g (100.0 g H2O + 5.60 g NH4NO3 = 105.6 g) and the specific heat capacity of the solution is 4.18 J/(g·K). A) 0.0° C B) 17.9° C) 11.6° C D) –54.8° C E) 26.1° CThe specific heat of octane, C8H181l2, is 2.22 J>g@K. (a) Howmany J of heat are needed to raise the temperature of 80.0 gof octane from 10.0 to 25.0 °C? (b) Which will require moreheat, increasing the temperature of 1 mol of C8H181l2 bya certain amount or increasing the temperature of 1 mol ofH2O1l2 by the same amount?Sports trainers use cold packs containing ammonium nitrate for injured athletes. Calculate the change in temperature when 44.4 g of ammonium nitrate (NH4NO3, molar mass = 80.1 g/mol) dissolves in 100 g water? Assume the specific heat of the solution is 4.5 J/(g ·°C). Check your signs! NH4NO3(s) NH4+(aq) + NO3– (aq) ΔH= 21.1 kJ/mol IMPORTANT! Answer in the following format: • Collect and Organize O What are you solving for? O What information are you given? • Analyze O What information do you need? O How will you connect the information you have and the information you need to solve this problem? (Provide a unit plan) • Solve O Solve the problem. Be sure to show all units and write clearly. • Think O Does your answer make sense? How do you know?