20. The chemical equation for the reaction between hydrochloric acid and sodium hydroxide is HCI(aq) + NaOH(aq) → NaCl(aq) + H2O(1) When 25 mL of 1.0 M HCl (36.5 g/mol) is mixed with 25 mL of 1.0 M NaOH (40 g/mol), the temperature change of the mixture is 6.9 °C. The density of the mixture is 1.00 g/mL and the specific heat of the solution is 4.18 J/ g °C. What is the enthalpy change for this reaction? а. -1.4 kJ b. -29 kJ с. 29 kJ d. -58 kJ

A student dissolves 14.9 g of potassium hydroxide (KOH)in 300. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 23.0 °C to 33.0 °C over the course of 5 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: KOH(s) K+ (aq) + OH(aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to 3 significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔΗ. per mole of KOH. rxn exothermic…

3.61 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate ∆H, in kJ/mol, for the dissolution of MgSO₄. (The specific heat of water is 4.18 J/g･°C and the density of the water is 1.00 g/mL). You can assume that the specific heat of the solution is the same as that of water.

A student dissolves 13.4 g of sodium chloride (NaCl)in 250. g of water in a well-insulated open cup. She then observes the temperature of the water fall from 20.0 °C to 18.9 °C over the course of 6 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: NaCl (s) Na+ (aq) + CI (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔΗ per mole of NaCl.…

Carbon monoxide and nitrogen monoxide gases combine to form carbon dioxide and nitrogen gases according to the following balanced chemical equation: 2 CO (g) + 2 NO (g) → 2 CO₂ (g) + N₂ (g) AG°rxn = -689.6 kJ What will be the Gibbs free energy change (AGrxn) in kJ if the reaction occurs at 29.28 °C? (4 sf) The partial pressures of the gases are: CO: 0.02742 atm NO: 0.02045 atm CO2: 2.469 atm N₂: 2.517 atm

Zinc metal reacts with hydrochloric acid according to the following balanced equation: Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g) When 0.128 gg of Zn(s) is combined with enough HCl to make 54.4mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.3 ∘C to 23.7 ∘C.   Find ΔHrxn for this reaction as written. (Use 1.00 g/mL  for the density of the solution and 4.18 J/(g⋅∘C) as the specific heat capacity.) Express your answer in kilojoules per mole to two significant figures.

A 5.44 g sample of a laboratory solution contains 1.85 g of acid. What is the concentration of the solution as a mass percentage?

A student dissolves 11.7 g of potassium hydroxide (KOH)in 200. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 23.0 °C to 33.2 °C over the course of 3.6 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: KOH(s) K+ (aq) + OH (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy ΔΗ per mole of KOH.…

Zinc metal reacts with HCl according to the following balanced equation: Zn(s) + 2HCI(aq) --> ZnCl2(aq) + H2(g) When 0.140 grams of Zn(s) is combined with an excess amount of HCI to make 50.0 mL of solution in a coffee-cup calorimeter, all the zinc reacts, raising the temperature of the solution from 21.60°C to 24.60°C. Find AH for this reaction in kJ/mol. Assume the density of the solution is 1.00 g/mL and the specific heat capacity of the solution is 4.184 J/g°C. Use an atomic weight of 65.38 g/mol for Zn Hints: -q(reaction) = q(solution) %3D AH = q/mol of limiting reagent %3D Do not type units with your answer. Type your answer to three significant figures. the proper If this question is on an exam on your scrap paper report your answer number of significant figures but still type three significant figures online. Your Answer:

In a coffee cup calorimeter, 50.0 mL of 0.130 M AGNO, and 50.0 mL of 0.130M HBr are mixed. The following reaction occurs. Ag*(aq) + Br¯(aq) → AgBr(s) If the two solutions are initially at 23.51°C, and if the final temperature is 24.82°C, calculate AH for the reaction in kJ/mol of AgBr formed. Assume a mass of 100.0 g for the combined solution and a specific heat capacity of 4.18 J°C¯1g=1. 84.2 X kJ/mol