Given the heats of formations (ΔH°f) listed below, ΔH°rxn for the reaction Ca(OH)2 + 2H3AsO4 → Ca(H2AsO4)2 + 2H2O is ________ kJ. Heat of Formation for selected substances: ΔH°f Ca(OH)2 = –986.6 kJ/mol ΔH°f H3AsO4 = –900.4 kJ/mol ΔH°f Ca(H2AsO4)2 = –2346.0 kJ/mol ΔH°f H2O = –285.9 kJ/mol

Q: When a 9.55-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup…

A: Given : mass of NaOH = 9.55 g Mass of water = 100 g The heat absorbed by the reaction is given by  Q…

Q: The reaction of 2SO3(g)=2SO2(g)+O2(g) has an enthalpy change of 198kJ. How many grams of sulfur…

A: From the given reaction we can see that when 2 moles of SO2 is produced, 198 KJ of energy is…

Q: 5.99 From the enthalpy of formation for CO, and the following information, calculate the standard…

A: Given data:  ∆H°=-283 kj/mol From standard table;  ∆Hf°(CO2(g) is given by, ∆Hf°=-393.5 kj/mol

Q: The thermochemical equation for the combustion of methanol is CH3OH (g)  +  3/2 O2(g)  →  CO2(g)  +…

A: Here we are required to find the heat produced on burning 5 gm of methanol

Q: When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution…

A: enthalpy of dissolution, ∆Hdissolution = mass (m) ×specific heat capacity(s) ×temperature change…

Q: Methane (also known as natural gas) is combusted with oxygen to produce heat according to the…

A: Number of mol of CH4 required = Q/∆Hrxn Q =  m . Cs . (T2 - T1) Given that: m = 100.0 g Cs = 4.184…

Q: Hot packs can be made from calcium chloride by mixing/reacting it with water (reaction shown below).…

A: A numerical problem based on enthalpy change of reaction, which is to be accomplished.

Q: 1. A gas is confined to a cylinder under constant atmospheric pressure. When 0.49 KJ of heat is…

A: Heat Heat is the result of the movement of kinetic energy within a material or an item, or from an…

Q: Using these reactions, fi nd the standard enthalpy change for the formation of 1 mol Pb0(s) from…

A: Using Hess law, we can calculate the standard enthalpy change.

Q: Liquid hydrogen peroxide releases oxygen gas in its decomposition. 2 H202 - 2 H20 + O2 AH rxn =…

A:

Q: Carbon occurs in two forms, graphite and diamond. The enthalpy of the combustion of graphite is…

A: given,  1) combustion of graphite C (graphite) + O2(g) → CO2(g) ,   ΔH1 = -393.5 KJ     -1 2)…

Q: A student performs a calorimetry experiment. The student combines 100. g of 0.40 M HC1(aq) with 100.…

A: Heat absorbed by the particular species = mass × heat capacity × temperature change

Q: How much heat in kilojoules is evolved or absorbed in each of the following reactions?   Burning of…

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Q: Methanol is an organic solvent that can be used as a fuel in some automobiles. 2 CH3OH(l)…

A: Given: volume of methanol (CH3OH) = 15 mL density of methanol = 0.792 g/mL molar mass of methanol =…

Q: -A block of iron metal weighing 5.00 grams with a temperature of 75.0°C was immersed in a beaker…

A:

Q: When methanol, CH, OH, is burned in the presence of oxygen gas, O,, a large amount of heat energy is…

A:

Q: The AH for the solution process when solid sodium hydroxide dissolves in water is 44.4 kJ/mol. When…

A: Given that : ∆Hsolution=44.4 kJ/molThe mass of NaOH=10.9 gThe mass of water=253 gInitial…

Q: A cube of brass, 2cm on a side. It is heated until the temperature is 75 C. The cube is then quickly…

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Q: When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution…

A: Heat of dissolution :-          The enthalpy of solution, enthalpy of dissolution, heat of…

Q: How much heat evolves when 86 mL of benzene C6H6 is consumed in the combustion reaction below? The…

A: We have to calculate the heat evolved.

Q: A 2.4 kg aluminum engine block heats up to 131.8 °C. Engine coolant at 22.2 °C is added to prevent…

A: By help of Following formula, we can calculate the mass of coolant - M1 C1 ∆T1 = M2 C2 ∆T2 Here, M1…

Q: Consider the reaction of carbon dioxide and water to form liquid methanol:   1/2 CO2(g) + H2O(l)…

A: The enthalpy is given for  the reaction (1/2)CO2(g) + H2O(l) -----> (1/2) CH3OH(l) + (3/4)O2(g)…

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

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Q: A 50.0-g sample of a copper-zinc alloy is heated to 100.0oC. The hot metal is quickly added to 100.0…

A: Specific heat capacity is the amount of heat in Joules is required by the substance to raise its…

Q: Given the following thermochemical equation: H2(g) + Br2(l) ⟶⟶ 2HBr(g)            ΔH = -72.4 kJ…

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Q: The overall reaction in commercial heat packs can be represented as the reaction below. 4 Fe(s) + 3…

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Q: If the heat produced by the reaction of combustion of 1 mole of ethanol (MMethanol" 46.07 g/mol) is…

A: Answer :- 4.60 × 103 (kJ/mol)  Heat produced by combustion of 155 g Ethanol, C2H6O = 4.60 × 103…

Q: When 25.0 g hydrogen gas react according to the following reaction, how many kJ of heat are released…

A: Given thermochemical equation is  CO(g) + 3H2(g)   --> CH4(g) + H2O (g)  ;  ∆Hrxn = – 206 kJ Mass…

Q: Calculate the energy produced when 5.0 mol of CO2 are produced on the basis of the following…

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Q: The thermite reaction in which aluminum metal reacts with iron(III) oxide to produce a spectacular…

A: The reaction is as follows: 2Al(s)+Fe2O3(s)--------->Al2O3(s)+2Fe(l).          ΔH =  -202.9 kcal.…

Q: 10.) The heat of formation of H2SO4 (ag) is -909.27 kl/mol. Which of the following is the…

A: Given:  Heat of Formation for H2SO4 is -909.27kJ/mol

Q: A scientist measures the standard enthalpy change for the following reaction to be -891.8 kJ :…

A: A) ΔHrxn= (Hf )products - (Hf )reactants   Hf NH3 = -45.90 kJ/mol (2mol) Hf N2O = x kJ/mol (3mol) Hf…

Q: Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the reaction: (1) CH4…

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Q: The standard heat of formation of HCl(g) is -92.3 determine Hrxn (in KJ) for a reaction:…

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Q: absorbs 1.357E3 J of heat. The final temperature of the sand is 6.7E1 °C. What is the mass (in g) of…

A: Given: Initial temperature = 2.24E1 °C Final temperature = 6.7E1 °C Amount of heat absorbed =…

Q: The table lists the specific heat capacities of select substances. Substance Specific heat capacity…

A: Given that:  Mass of unknown substance(m)= 10.5g  Heat (q) = 53.8J dT = 13.3°C

Q: Limestone, CaCO3, when subjected to a temperature of 900°C in a kiln, decomposes to calcium oxide…

A: The decomposition reaction of limestone CaCO3 is as follows:   CaCO3(s) → CaO(s) + CO2(g) The…

Q: 3. Define calorimetry and describe the two commonly used calorimeters. 4. When a 1.50 g sample of…

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Q: 1. Calcium carbonate decomposes at high temperatures to form carbon dioxide and calcium oxide: Given…

A: We have given that  Calcium carbonate decomposes at high temperatures to form carbon dioxide and…

Q: Assume that the specific heat of the solution is the same as that of pure water. 5.54 (a) When a…

A: Given: Mass of solution= 60g  Mass of sample = 3.88g Initial temperature = 230C Final temperature =…

Q: When a 1.50g sample of solid sodium hydroxide dissolves in 60.0g of water in a coffe cup…

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Q: 1. A student is determining the enthalpy of solution for ammonium nitrate by adding ammonium nitrate…

A: A calorimeter is used to find the amount of heat involved in a chemical reaction. The knowlede of…

Q: O THERMOCHEMISTRY Using Hess's Law to calculate net reaction enthalpy Lindsay Dimethyl ether, a…

A: Applying concept of Hess law.

Q: When a 6.50 g sample of solid NaOH dissolves in 100.0g of water in a coffee-cup calorimeter, the…

A: Given information: Mass of sample = 6.50 g Mass of water = 100.0 g Initial temperature = 21.6 °C…

Q: In the following reaction, how many moles of CH,0H are required to give off 3791 kJ of heat? 2 CH,OH…

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Q: The value of ΔH0 for the reaction CH3OH(l) → CO(g) + 2H2(g) is +128.1 kJ. Determine the heat…

A: Given, The balanced chemical equation is given below, CH3OH(l) → CO(g) + 2H2(g) ΔH0=+128.1 kJ

Q: 6. The heat of combustion of liquid ethylene glycol, C2H6O2 is -1189.2 kJ/mol. In an experiment 4.34…

A: All the details are explained in handwritten solution.

Q: The combustion of butane, C4H10, is given as: 2C4H10(g) + 1302(g) 8CO2(g) + 10H,O(1), AH° = -5314…

A: Given :-  2C4H10(g) + 13O2(g) →8CO2(g) + 10H2O(g)                                            ∆H =…

Q: When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution…

A: The heat of dissolution of MgCl2=heat absorbed by calorimeter+Heat absorbed by the solution.…

Q: When 50.0 g of 0.200 M NaCl(aq) at 24.1 °C is added to 100.0 g of 0.100 M AgNO3(aq) at 24.1 °C in a…

A: