A calorimetry experiment determined that the combustion of 1.01 g of H2(g) reacting with excess O2(g) gave qsoln = 143 kJ. Calculate AH for the reaction: H2(g) + ½ O2(g) → H20 (I)
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- Consider the following reaction: 2 CH3OH(g) → 2 CH4(g) + O2(g) DH = 252.8 kJ (a) Is reaction exothermic or endothermic? ANSWERED (b) Calculate the amount of heat transferred when 24.0 g of CH3OH(g) is decomposed by this reaction at constant pressure. ANSWERED (c) For a given sample of CH3OH, the enthalpy change during the reaction is 82.1 kJ. How many grams of methane gas are produced? ANSWERED (d) How many kilojoules of heat are released when 38.5 g of CH4(g) reacts completely with O2(g) at constant pressure?QUESTION 2 What is the specific heat capacity of Al if 991.5 J were required to heat 35.83 g of it from 25.0°C to 55.68 °C? Key Concept:: Calorimetry. When a substance is heated, the heat absorbed is equal to the product of mass of substance being heated times the temperature change times the specific heat capacity, q = s*m*ΔTQUESTION 1 How many grams of CaO must be added to 50.0 mL of water to make the temperature increase from 25.0 °C to 58.56 °C? The reaction is CaO(s) + H 2O(l) ↔ Ca(OH) 2(aq) -- ΔH = -83.7 kJAssume the heat capacity of the solution is the same as pure water (4.184 J/g*°C), the density of the solution is 1.00 g/mL and there is no loss of heat to the surroundings. Key Concept:: Calorimetry and enthalpy change is an extensive property. V, d → m solution; ΔT, heat capacity → heat; ΔH→ mol of CaO → mass CaO
- QUESTION 3 How much heat (in kilojoules) is involved when 40.86 g of NH 3 react with excess oxygen according to the reaction below? 4 NH 3(g) + 5 O 2(g) ↔ 4 NO(g) + 6 H 2O(l) --> ΔH = 1168 kJKey Concept:: Enthalpy is an extensive property, i.e. the magnitude is dependent upon the amount of material involved in the change.Question 13 The enthalpy of combustion of methane gas, CH4(g), is about -9.0*102kJ/mol. When methanegas reacts with O2(g), the products are carbon dioxide CO2(g) and water H2O(l). How much heatis released during the combustion of methane gas when 2.0 mols of O2(g) are consumed. Expressyour answer in kJ. A. 3.0*102kJ B. 6.0*102kJ C. 9.0*102kJ D. 12*102kJ E. 18*102kJThe enthalpy of combustion of isooctane (C8H18(l)) is -5461 kJ/mol. From data found in appendix G, calculate the enthalpy of formation of C8H18(l): C8H18(l) + 12.5 O2(g) → 8 CO2(g) + 9 H2O(l) ∆Hrxn = -5461 kJ ∆Hf = ___ kJ/mol Correct answer is not 259.2
- Please assist me with my practice question. The combustion of butane is shown by the following equation: 2C4H10 (l) + 13O2 (g) → 8CO2 (g) + 10H2O(g) Use the following data and the summing method to find the heat of reaction for the above equation. Note: Show all calculations, follow the rules of significant figures, and box your final answer. C(s) + O2 (g) → CO2 (g) + 393 kJ H2 (g) + ½O2 (g) → H2O(g) + 242 kJ 4C(s) + 5H2 (g) → C4H10 (g) + 125 kJQUESTION 8 Determine ΔH for the third reaction from the information given. 2 CO2(g) ↔ 2 CO(g) + O2(g) ΔH = 566.0 kJ 3 CO(g) + O3(g) ↔ 3 CO2 ΔH = -992.0 kJ 3/2 O2(g) ↔ O3(g) ΔH = ? Key Concept: Hess's law. The enthalpy change of an overall reaction is simply the sum of the enthalpy changes for individual steps that give the overall reaction.If ethanol (15.0 g) is burned, how much heat is released? Ethanol MW = 46.07 g/mol C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) ΔH°rxn = –1367 kJ/mol Answer: 445 kJ, just need steps TY!
- 59. When 24.0 g of carbon and 10.0 g of hydrogen are placed in a calorimeter and reacted according to the equation 3 C(s) + 4 H2(g) → C3H8(g) + 103.8 kJ, the maximum amount of heat liberated by this reaction is? (hint: limiting reagent) Answer: 69.1 kJan important flavor component of vanilla extract is vanillin C8H8O3 molar mass = 152.15 g/mol when vanillin burns in a bomb calorimeter with a heat capacity of 8.60 kJ/°C the temp increases from 25.97°C to 31.18°C. if the heat of combustion of vanillin is -3760 kJ/mol what mass of vanillin (in g) was combusted? answer to two decimal placesQuestion: When 2.26 g of a salt dissolves in 121 mL of water (density = 1.00 g/mL) in a coffee-cup calorimeter, the temperature rises from 13.0°C to 24.0°C. Determine q for the solution process, assuming that Ccal ≈ Cwater.Include the mass of salt in your calculation.