The sign of ΔH for an endothermic process is ___, because it________

Q: A 25.0 g block of copper (specific heat capacity 0.380 J/g･°C) at 81.2 °C is placed into 500.0 g of…

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Q: 8. The value of ΔH0for the reaction CH3OH(l) → CO(g) + 2H2(g) is +128.1 kJ. Determine the heat…

A: The amount of energy liberated or absorbed in a chemical reaction is expressed by the change in…

Q: What is the sign of ΔH for an exothermic reaction?An endothermic reaction?

A: The sign of ΔH for an exothermic reaction or an endothermic reaction has to be given below.

Q: A 25.0 g block of copper (specific heat capacity 0.380 J/g-°C) at 88.0 °C is placed into 500.0 g of…

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Q: A hot sample of unknown material is placed into a calorimeter containing 42.1 g of water at 22.0 °C.…

A: Mass of water = 42.1 g  Initial temperature = 22.0 °C  Final temperature = 62.7 °C  Specific heat…

Q: A 10. g block of metal is heated to 105.00 °C and then dropped into 25 g of water. The water…

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Q: 4. Consider the reaction 2 H2 (g) + O2 (g) → 2 H2O (g) having AH = -484 kJ/mol. Determine the…

A: In the given case, hydrogen is the limiting reagent for the reaction because 4 mol of hydrogen gas…

Q: In a calorimeter, you mix together 31.0 grams of a solution of acid and 30.0 grams of a solution of…

A: Neutralization reaction between acid and base is an exothermic reaction. The heat released during…

Q: Using Hess's Law to calculate net reaction enthalpy Dimethyl ether, a useful organic solvent, is…

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Q: Hydrogen peroxide releases oxygen gas on decomposition: 2 H202 (1) --> 2 H20 (1) + O2 (g) ΔΗ - 196.1…

A: Given, 2H2O2(l) ➝ 2H2O(l)  + O2(g)  ∆Hrxn = -196.1 kJ mass of H2O2 decomposes = 652 g amount of heat…

Q: Use the heat equation to calculate the energy, in joules and calories, for each of the following…

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Q: he value of ΔH0for the reaction is -126 kJ. Determine the heat released when 2.00 mol of NaOH is…

A: For a chemical reaction, the enthalpy of reaction (ΔHrxn) is the difference in enthalpy between…

Q: Upon the decomposition of baking soda, carbon dioxide is release, which causes a cake to rise while…

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Q: Classify each process as endothermic or exothermic. What is the sign of ΔH for each process? Explain…

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Q: 7.Heat is taken in by a system and work is done on the system by its surroundings. The internal…

A: The change in internal energy (ΔU) is given by ΔU = q + w where q = heat energy  w = work done

Q: 23.12-gram metal bar sample at 76.21 °C is placed in a constant- pressure calorimeter containing…

A: In this problem the specific heat of metal bar is to find.

Q: A hot sample of unknown material is placed into a calorimeter containing 42.1 g of water at 22.0 °C.…

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Q: The value of ΔH0 for the reaction below is -186 kJ.  Determine the heat released from the reaction…

A: Standard enthalpy change of reaction is defined as the amount of heat released or produced in the…

Q: Consider the combustion of propane, C3H8, the fuel that is commonly used in portable barbeque…

A: The chemical reaction corresponding to the combustion of propane is given as, The amount of heat…

Q: - Hydrogen gas and oxygen gas release 482.6 kJ of heat when they combine to form steam. Is this…

A: Given :  H2 + O2 ---> H2O  Amount of heat released = 482.6 kJ  To determine :-  Whether the…

Q: A system does 500 joules of work on the surroundings, AND the system receives 600 joules of heat…

A: Given:  Work = ∆W = 500 J on the surrounding Heat = ∆Q = 600 J from the surrounding Change in…

Q: Given the thermochemical equations A(g) - - B(g) AH 60 kJ B(g) C(g) AH -140 kJ find the enthalpy…

A: A -------->  B     delta H = 60KJ B -----------> C     delta H = - 140KJ

Q: If 250. g of aluminum is consumed in the reaction, how much heat (in kJ) could theoretically be…

A: 2 Al (s) + Fe2O3 (s) → 2 Fe (l) + Al2O3 (l)              ΔH = −848.0 kJ In the given reaction there…

Q: Identify each energy exchange as primarily heat, work or both and determine whether the sign of AE…

A: Hello. Since the question contains more than three subparts, the first three sub-parts shall only be…

Q: given the thermochemical equation:  CH4 (g) + 2 O2 (g) -> CO2 (g) + 2H2O (l)  H = -890kJ is this…

A: Exothermic reaction: A reaction which evolves heat is called exothermic reaction. In an exothermic…

Q: The value of ΔH° for the reaction below is +128.1 kJ: CH3OH (l) → CO (g) + 2H2 (g) How many kJ of…

A: Given: The reaction is as follows, CH3OH (l) → CO2(g) + 2H2(g)          ∆H° = +128.1 kJ Mass of…

Q: A mixture of butane and oxygen gases are contained in a cylinder with a moveable piston lid. A spark…

A: Given, the gas expands and heat is released by the gas.

Q: An original reaction and enthalpy is given below. 2CH4(g) + 302(g) → 2CO(g) + 4H20(g) AH = -1168 kJ…

A: Given reaction : 2CH4(g) + 3O2(g) --------> 2CO2(g) + 4H2O(g) ∆H = -1168KJ It is an exothermic…

Q: Consider the following thermochemical equation: 2NO(g) + O2(g) - 2NO2(g) AH = -113.2 kJ What is the…

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Q: The value of ΔE in kJ, for a system that does 213 kJ of work on its surroundings and loses 79 kJ of…

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Q: 15. The balanced equation below shows the combustion of propane gas: C3H8(g) 502(g) 3CO2(g) + 4…

A: The balanced chemical reaction is given below.

Q: Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on…

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Q: The value of ΔH° for the reaction below is -72 kJ. Therefore, ________ kJ of heat are released when…

A: ΔH° < 0 => heat is releasing in the reaction. Since when 2 mol of HBr is forming, -72 KJ =…

Q: 12) Calcium carbonate decomposes at high temperature to form carbon dioxide and calcium oxide: Caco3…

A: To find the heat of the reaction for the below reaction. CaCO3 → CO2 + CaO Given that:

Q: 14. Which of the following statements are true about a system that absorbs 300J of heat from the…

A: Heat (q) is positive if heat is added to the system, and negative if heat is removed.Work (W) is…

Q: When an automobile engine starts, the metal parts immediately begin to absorb the heat released…

A: a) The heat is being absorbed by metal parts , so the metal parts are in observation. Hence, metal…

Q: Using Hess's Law to calculate net reaction enthalpy Nitric oxide (NO) can be formed from nitrogen,…

A: The enthalpy change is a state function and the Hess law states that the change of enthalpy in a…

Q: Given the hypothetical thermochemical equation: A + B —> C + D ΔH = - 430 kJ Which among the…

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Q: Temperature of 150. g of iron increased from 27.1 °C to 33.1 °C after absorbing 406 J of heat, what…

A: Given; mass of iron = 150.0 g Initial temperature = 27.1 oC Final temperature = 33.1 oC Heat…

Q: Ethanol can be created by reacting hydrogen gas, carbon, and oxygen together. Using the following…

A: The reactions given are,

Q: 1. The standard enthalpy changes for the formation of aluminium oxide and iron (III) oxide are 2…

A: Note : Since you have posted multiple questions, we are entitled to answer the first only. Please…

Q: 1. Calculate the heat of reaction for the last reaction shown: (Use Hess's Law and the following two…

A: Given that,The reaction is

Q: The highly exothermic thermite reaction, in which aluminum reduces iron(III) oxide to elemental…

A: Heat is arises due to change in temperature and heat is transferred from hotter body to colder body.…

Q: Explain the difference between an exothermic and an endothermic reaction. Give the sign of ΔH for…

A: In exothermic reactions, heat is released in the reaction. The sign of ∆H is negative.

Q: The enthalpy of combustion of methane gas, CH4(g), is about -9.0*102 kJ/mol. When methane gas reacts…

A: Combustion is the process of reaction of a compound with excess of oxygen gas. The products of…

Q: When a 25.0 g sample of AgNO3 dissolves in 100.0 g of water in a calorimeter, the temperature drops…

A: Given that,  Amount of AgNO3 dissolves in water w = 25 g Molar mass of AgNO3  Mw = 169.87 g/mol…