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Q: What is qH2O? b.) What is qrxn c.) What is ΔHrxn?
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Q: How do you do E4b?
A: Given reactions are :
Balance & calculate ΔH°(tot) from ΔHf°’s in T6.5 and listed below:
__NH3(g) + __O2(g) → __NO(g) + __H2O(g) ΔH°(tot) = ____kJ
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- The same student wanted to determine the heat of dissolution for potassium chlorate (KClO3, MW: 122.55 g/mol) in water. He measured 10 grams of KClO3 and dissolved it in a calorimeter containing 250 g of water. The temperature drop was 3.5 K. What is qH2O in Joules? What is qdissolution in Joules? What is the ΔHdissolution in kilojoules per mole? What is the ΔHdissolution in kilojoules per mole?2N2(g) + 3O2(g) ® 2N2O3(g) (delta)H°rxn = +86.6 kJ Consider a reaction mixture of 13 grams of 7N and 17 liters at STP (LSTP) of O2: … If all 13 grams of 7N react, the reaction heat is: _________ kJ … If all 17 LSTP of O2 react, the reaction heat is: _________ kJ … The limiting reagent in this mixture is _____ … The theoretical heat of this reaction mixture is: _______ kJA 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?
- The same student wanted to determine the heat of dissolution for potassium chlorate (KClO3, MW: 122.55 g/mol) in water. He measured 10 grams of KClO3 and dissolved it in a calorimeter containing 250 g of water. The temperature drop was 3.5 K. a.) What is qH2O? b.) What is qrxn c.) What is ΔHrxn? d.) Is the reaction endothermic or exothermic?A coffee-cup (constant pressure) calorimeter is used to carry out the following reaction in 63.5 mL water (where X is a hypothetical metal): X + 2 HCl → XCl2 + H2 In this process, the water temperature rose from 25.0 °C to 34.1 °C. If 0.00618 mol of "X" was consumed during the reaction, what is ΔrH of this reaction in kJ mol-1 with respect to "X"? The specific heat of water is 4.184 J g-1 °C-1 Express in 2 sig digs!The formulas give the enthalpy when Coal and Methane react with oxygen:C+O2->CO2+394 kJ/mol, 12 gram C gives 44 gram of CO2+394 kJCH4+ O2->CO2+2H2O+891 kJ/mol, 16 gram CH4gives 44 gram of CO2+891kJ 1-Calculate the heating value of Coal and Methane in MJ/kg and in kWh/kg.Calculate the lower heating value for Methane. 2-Calculate the amount of CO2 which is produced per kWh for Coal and Methane
- Oceanic uptake of carbon dioxide is thus described:CO2 (g) + H2O ⇔ H2CO3, K = [H2CO3]/PCO2 = 3 x 10-2 M atm-1 H2CO3 ⇔ HCO3- + H+, K = [HCO3-][H+]/[H2CO3] = 9 x 10-7 moles/LHCO3- ⇔ CO32 - + H+, K = [CO32 -][H+]/[HCO3-] = 7 x 10-10 moles/LCharge balance equation:[H+] = [OH-] + [HCO3-] + 2[CO32 ] If the CO2 concentration in the atmosphere is 300 ppm, what is the pH of the ocean?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 0.1 mole of water was formed in the experiment and Q is 7.2 kcal, calculate the heat of the reaction per mole of liquid water.hexane heptane ΔΗ°comb (kJ/mol) -4163.0 -4817.0 Liquid Denisty (g/mL) 0.493 0.684 By how much are the fuel values different? Give the magnitude of the difference (the absolute value). kJ/mL
- Use 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_thermicH2SO3 = 0.2556 M, Ka1 = 1.6 x 10-2 , Ka2 = 6.4 x 10-8 NaOH = 0.3106 M please show all work all information needed is hereIf the dissolution of CaCl2•2H2O (147.02 g/mol) is expected to release 44.8 kJ of energy per mole of CaCl2•2H2O dissolved, then what is the expected change in temperature (in oC) if 2.74 grams of CaCl2•2H2O are dissolved in 10.00 mL of water (density of 1.00 g/mL and specific heat capacity of 4.184 J/g•oC)? (Give answer as the absolute value of the temperature change; do NOT include negative sign if temperature decreases.)