In the design of an experiment to the measure the heat change of a chemical reaction in an aqueous solution we make the following assumptions:  (1) we assume our calorimeter is a perfect insulator and no heat is transfered to the surroundings and (2) we assume that negligible heat is absorbed by the calorimeter.  We could write the following equation representing the relationship between the heat changes in our system. qsystem = qcalorimeter + qreaction + qsolution Considering the design of the experiment, in the above equation which heat changes would we assume are equal to zero?

Q: A scientist measures the standard enthalpy change for the following reaction to be 79.4 kJ:…

A: The difference between the standard enthalpy of products and the reactants is known as change in…

Q: Calculate the enthalpy of combustion of propane, C3H8(g), for the formation of H2O(g) and CO2(g).…

A: The standard enthalpy of formation is also known as the standard heat of formation of a compound. It…

Q: A system does 551 kJ of work and loses 236 kJ of heat to the surroundings. What is the change in…

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Q: In order to calculate the total heat flow for a process in the calorimeter, you will need to…

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Q: Sign conventions for Heat (g) and Work (w) : The change in internal energy of a system can be…

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Q: Suppose that the molar enthalpy of a reaction is 19.68 kJ/mol and 26 grams of X (MW = 19.66)…

A: Molar enthalpy of reaction is a term used in chemical thermodynamics. Molar enthalpy of reaction is…

Q: A gas expands and does 256 J of work on its surroundings. At the same time it absorbs 220 J of heat…

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Q: Molar mass of C6H4O2 (quinone)= 108.092 g/mol 2.200 g quinone / 108.092 g/mol = 0.020353033 mol…

A: Heat of combustion of quinone + Heat gained by calorimeter = 0

Q: A system does 516 kJ of work and loses 256 kJ of heat to the surroundings. What is the change in…

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Q: 4. Which among the following refers to the value of internal energy. A 1025 J of heat energy is…

A: First law of thermodynamic says  Q = ΔE + W

Q: When 1.49 mL of 0.410 M of HI(aq) is combined with 9.66 mL of 0.570 M of NaOH(aq) in a coffee-cup…

A: The balanced reaction for the HI and NaOH is as follows: HI(aq) + NaOH(aq) → NaI(aq) + H2O(l) The…

Q: A calorimeter contains 18.0 mL of water at 14.0 °C. When 1.30 g of X (a substance with a molar mass…

A: Volume of water = 18 mLDensity Of water =1.00 g/mLMass of water = Volume of water * Density of…

Q: The standard heat of combustion of propanol, C3H7OH, is 2021 kJ/mol. How much heat would be…

A: Number of moles of any substance can be calculated by dividing the mass of the substance with its…

Q: .If a system does 84.0 kJ of work on its surroundings and releases 105 kJ of heat against a constant…

A: Given : Work done on surrounding by system = 84.0 KJ  And heat released = 105 KJ Since heat is being…

Q: A system does 566 kJ of work and loses 216 kJ of heat to the surroundings. What is the change in…

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Q: A scientist measures the standard enthalpy change for the following reaction to be 2885.4 kJ:…

A: 6CO2 (g)  + 6 H2O (l)  ---> C6H12O6 (s) + 6 O2 (g)  ∆Hrxn  = 2885.4 KJ/mol ∆H°f H2O = ?

Q: 5. The enthalpy change for the oxidation of naphthalene, C10H8, is AH =-5156kJ /mol C1, H) +120e)…

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Q: A system does 556 kJ of work and loses 251 kJ of heat to the surroundings. What is the change in…

A: From the first law of thermodynamics we have, ∆E =Q + W Where, ∆E is change in internal energy…

Q: If a system has 325 keal of work done to it, and releases S5.00 x 10 kJ of heat into its…

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Q: In a coffee cup calorimeter, 55.0 mL of 1.26 M CUSO, was reacted with 43.5 mL of 2.53 M KOH. The…

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Q: What two conditions must be met by a thermochemical equation so that its enthalpy change can be…

A: ∆Hf° is the sign of change in standard enthalpy of formation. Where , "∆" denotes change in enthalpy…

Q: hydrobromic acid, HBr(aq), is added to a 100.0 mL solution of 0.300 M potassium hydroxide, KOH(aq),…

A: Molarity of HBr = 0.100 M Volume of HBr = 300 mL = 0.30 L Moles of HBr = M × V     = 0.10 × 0.30 =…

Q: What is the change in internal energy (in J) of a system thatreleases 675 J of thermal energy to its…

A: Thermodynamics is the branch of chemistry which deals with the study of heat and other forms of…

Q: a system recieves 425J of heat and delivers 425J of work toits surroundings. what is the change in…

A: Given Heat ( q ) = +425 J ( as heat is received to system ) Work ( w) = +425 J ( as work done by…

Q: A gas is compressed in a piston with 8.80E1 J of work. As a result, 4.2E1 J of heat is given off to…

A: Solving only first question in accordance with the guidelines. We will answer this question using…

Q: gas in a cylinder is compressed by a piston. If the work done by the piston is 451 J, and the system…

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Q: How does the thermochemical equation S (s) + O2 (g) - SO2 (g), AH = -296 kJ, need to be modified to…

A: Enthalpy (∆H) is a property which is the sum of systems internal energy and the product of it's…

Q: Explain the difference between the change in internal energy and the change in enthalpy of a…

A: Change in internal energy (∆U): Internal energy is the sum of Potential energy and the work done of…

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 412.0 mg sample…

A: The molar heat capacity of a compound is defined as the amount of heat required to raise the…

Q: What is the change in the internal energy of the system if the surroundings releases 300J of heat…

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Q: Ammonium sulfate, (NH,),SO4, is used as a fire retardant and wood preservative; it is prepared…

A: Molar mass of (NH4)2SO4 = 132 g/mol Standard enthalpy of formation of ammonium sulfate ( in…

Q: 3. A coffee-cup calorimeter is used to determine the heat of reaction for the acid-base…

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Q: A scientist measures the standard enthalpy change for the following reaction to be -351.2 kJ :…

A: The enthalpy of the formation of the substance is ; ∆H = enthalpy change for the reaction = 351.2 KJ…

Q: Balance the following chemical equation, name the reactants and products, and calculate the enthalpy…

A: The equation is given as,

Q: When 25.0 mL of 1.0 M H2SO4 is added to 50.0 mL of 1.0M NaOH at 25 °C in a calorimeter, the…

A: Given that 25.0 mL of 1.0 M of H2SO4 is added with 50 mL of 1.0 M of NaOH solution at 25°C Recall…

Q: Use the following thjt Fermentation of fruits and grains converts glucose to ethanol and carbon…

A: Given, Fermentation of fruits and grains converts glucose to ethanol and carbon dioxide. The…

Q: What is the change in internal energy (in J) of a system that absorbs 0.697 kJ of heat from its…

A: This can be done using first law of thermodynamics.

Q: When a 12.5 g sample of NaOH(s) dissolves in 367.0 mL water in a coffee cup calorimeter, the…

A: Heat of dissolution can be estimated in a calorimeter and is defined as the energy released to…

Q: The standard heat of formation, Af Hº, is defined as the enthalpy change for the formation of one…

A: Elements in their standard state have ΔH°f = 0 Standard state of Lithium is Li (s) Standard state of…

Q: A system receives 425 J of heat and delivers 425 J of work toits surroundings. What is the change in…

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Q: You discover a new substance and wish to determine its specific heat capacity. Your sample weighs…

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Q: Which of the following statements is/are CORRECT?   1. If a reaction occurs at constant pressure, q…

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Q: a system does 596 kJ of work and loses 276 kJ of heat to the surroundings. What is the change in…

A: According to first law of thermodynamic, The total internal energy is

Q: 6. The oxidation of methylhydrazine, N,H,CH,(), by dinitrogen tetroxide, N,0,(1), was used for…

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Q: Suppose that the reaction of 2.857 moles consumes 2.45 kJ of heat. What is the molar enthalpy of the…

A: The molar enthalpy of a reaction is change in enthalpy of one mole substance that is undergoing…

Q: In a generic chemical reaction involving reactants A and B and products C and D, aA + 6B+cC + dD,…

A: The reaction taking place is given as, And the standard heat of formation data given is,

Q: A quantity of 50.0 mL of 0.200 M Ba(OH)2 is mixed with 50.0 mL of 0.400 M HNO3 in a…

A: The balanced chemical equation is written as, BaOH2aq+2HNO3aq→BaNO32aq+2H2Ol The required amount of…

Q: A system gains 667 kJ667 kJ of heat, resulting in a change in internal energy of the system equal to…

A: According to the first law of thermodynamics; Consider the given information is as follows;…

Q: A system absorbs 1.54E2 kJ of heat and the surroundings do 1.118E2 kJ of work on the system. What is…

A: 2.618E2 = 2.618 * 10^2 kJ