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- The following reaction using hydrogen and oxygen is carried out in a bomb calorimeter: 2H2(g) + O2(g) → 2H2O(l) The specific heat of the reaction vessel is 0.200 kcal/0C-kg and the specific heat of water is 1.00 kcal/0C-kg. Assuming that m is 0.2 mole of water was formed in the experiment and Q is 4.4 kcal, calculate the heat of the reaction per mole of liquid water.The specific heat of an unknown liquid is determined using a sample of molybdenum (Mo) with a mass of 35.12g. The Mo is heated to 99.2OC in boiling water, and then transferred to 52.16g of unknown liquid whose temperature is 23.4OC. The final temperature of the Mo-unknown liquid system is 28.9OC. Calculate the specific heat of the unknown liquid. CMo = 0.251 J•g-1•OC-1Use the molar DHf° under the formulas to calculate DH°rxn for the equations as balanced: 1. 2B2H6(g) + 3CO2(g) --> 2B2O3(s) + 3CH4(g) ΔH°rxn = _______ kJ ΔH°f = +36 –394 –1274 –75 kJ/mol exo ? endo_thermic 2. 2P2O5 + 2CaC2 -->P4 + 2CaCO3 + 2CO2 ΔH°rxn = _______ kJ ΔH°f = –1505 –59 ___ –1207 –394 kJ/mol exo ? endo_thermic 3. 2Na2CrO4(s) + 10HCl(g) --> 4NaCl(s) + 3Cl2(g) + Cr2O3(s) + 5H2O(l) ΔH°f = –1342 –92 –411 ___ –1140 –286 kJ/mol ΔH°rxn = _______ kJ exo ? endo_thermic
- The density of all solutions are 1.0g/mL and their respective heat capacities 4.184J/g.K. NH4OH(aq)+ HCl(aq)--> NH4Cl(aq)+H2O(l) Volume of 2.0 M HCl 25.0mL NUmber of moles of HCl ? Temperature of HCl 15oC Volume of 2.0 M NH4OH 25.0 mL Number of moles of NH4OH ? Temperature of NH4OH 15oC Intitial Temperature 15oC Final Temperature 23.5oC Change in Temperature ? Calculate qr in J (qr=-qsol) using qr=-mC(change in temperature). What is the enthalpy change ( Delta H) in kJ.mol-1, when 1 mole of acid is neutralized? delta H=qr/nHClA 3kg cat is placed in a calorimeter with 1000mls of water being circulated through coils at the top of thechamber for 2 hours. During that time the calculated change in water temperature is 13°C.a. What is the metabolic rate of the cat in both kcal/hr as well as kJ/hr?b. What would the daily energy requirements be for the cat?c. What is the cat’s metabolic rate per kg of body mass?A pellet of benzoic acid standard was combusted in a bomb calorimeter to determine the experimental calorimeter constant. After 6 mins of monitoring the temperature, the bomb was fired. The following data were obtained. mole of benzoic acid: 0.0049 mol mass of burnt fuse wire: 0.0125 g qwire,surr: 5858 J/g ΔHcombustion of benzoic acid: -3228.0 kJ/mol Δng (combustion of benzoic acid): -0.5 mol R: 8.314 J/mol•K r1: 0ºC/min r2: 0ºC/min Tf: 30.4ºC Ti: 28.4ºC Determine the calorimeter constant (in J/ºC). Report your answer in 2 decimal places.
- One kilogram of boiling water is poured into an empty thermos whose mass is 1kg and whose temperature is 25oC. No heat is lost from the thermos. The specific heats of water and the thermos are 1 and 0.5 kcal/kg-oC, respectively. Their final temperature is?In constant pressure calorimeter 75.0 ml is mixed with 1.25 M Hydrocloric acid solution is mixed with 75.0 ml of 1.25 M Sodium hydroxide solution. the density of the final solution is 1.00g/ml and the the solution both initially 21.45c, reach a maximum temperature of 28.32c when mixed. based on this information, and estimating the solution's heat capacity as 4.18Jg-1c-1, what is the amount of heat in Kilojoules, transferred in this reaction?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 / mole
- Mass of Empty Calorimeter is 7.73g, mass of calorimeter + water is 46.875g, mass of water is 39.145g, mass of metal is 6.354g, initial temperature of water is 20 degrees, initial temperature of metal is 100 degrees Celsius, Final temperature of calorimeter is 21.5 degrees Celsius, T(T-Final - T-Initial) is 78.5 degrees Celsius, q-calorimeter is 1841.29J, Specific Heat c, of Metal is 3.69 J/g degrees Celsius, Calculate molar mass of metal.Using data for DHof (KJ/mol) provided below, calculate DHoRxn for: N2O(g) + 3H2(g) ---> N2H4 (l) + H2O (l) DHof (KJ/mol): N2O(g) = 33.85 ; H2 (g)= 0 ; N2H4 (l)= 50.4 ; H2O(l) = -285.8To determine the specific heat of a newly created, highly conducting material, a 704.8 mg sample of the material was supplied with 35.548 J of heat causing the temperature of the material to rise from 297.05 K to 461.4 K. What is the specific heat of this material? Report your answer in units of J/(ºC · g) to 4 sig figs, but do NOT include units in your answer.