Chemical and physical changes 12. For the following question, assume a chemical change that is endothermic taking place at constant p =1 bar. %3D a. What is meant by a chemical change? b. What is the sign of the enthalpy change in this endothermic process? c. Assuming this chemical change can be described by standard enthalpy of formation values, what conditions does the change take place under (what state? What temperature can be assumed if not stated)? d. Explain why an endothermic chemical change both requires and releases energy. Your explanation should include what is occurring on the molecular level.

Q: A student performed this experiment by mixing 50.0 mL of 2.0 M NaOH solution with 50.0 mL of 2.0  M…

A: Given: Concentration of NaOH reacting = 2.0 M Volume of NaOH solution = 50.0 mL = 0.050 L…

Q: Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to…

A: Given information:

Q: How much energy is required to heat 100.0 g acetone (molar mass=58.08 g/mol) from a solid at…

A: In this question, we want to determine the amount of energy is required to heat 100.0g acetone from…

Q: Calculate the change in molar enthalpy of carbon dioxide assoicaited with raising the temperature of…

A: The question can be solved by using integration. The detailed solution is shown below.

Q: An air sample contains 10% H2O(g) by mole   at 100 °C, 1 atm. a.At what temperature would be the…

A: Given information: Composition of H2O = 10% Temperature = 100 °C Pressure = 1 atm

Q: A 30 g ice cube at 0 °C is put in an equal mass of 98 °C water in an insulated container, and…

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Q: How much energy is required to heat 100.0 g H2O from a liquid at 20.0°C to a complete gas at 100 °C?…

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Q: O THERMOCHEMISTRY Understanding the definitions of heat and work ARL A mixture of gaseous reactants…

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Q: A 36.0 g sample of liquid water at 100.0oC is heated to 145.0 oC.   How much heat does the water…

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Q: The following information is given for water at 1 atm: AHvap (100.00°C) = 2.259 x 10° J/g AHfus…

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Q: A 33e1289 sample F an unknown metal is heated to 10001°C in e hot waterc bath untill thermar…

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Q: Consider the combustion of one mole of H2 with 1/2 mole of O2 under standard conditions, as…

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Q: 14 g of nitrogen gas (N2) gas undergoes isothermal compression at 27 degrees C. Its initial volume…

A: From thermodynamics formula for isothermal compression of ideal gas is calculate. The question is…

Q: When 24.89 grams of fictional compound X is added to water to make 314.9 grams of solution, the…

A: Given: Mass of compound added = 24.89 g. Molar mass of compound = 123.72 g/mol. Initial temperature…

Q: The following information is given for antimony at 1 atm: T- 1440.00C T - 631.00°C Specific heat…

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Q: Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to…

A: The reactions given are, (1) C(diamond) + O2 (g)  → CO2 (g)…

Q: A quantity of 3.10 × 102 mL of 0.650 M HNO3 is mixed with 3.10 × 102 mL of 0.325 M Ba(OH)2  in a…

A: Calculation of no. of mol of HNO3: Calculation of no. of mol of Ba(OH)2:

Q: A heating-cooling system cycles gases between states. Assume this system is using 1.00 moles of an…

A: According to the question we have, Number of moles (n) =1.00 mole Specific Heat at constant volume…

Q: For the following four maxwell RELATION; give a physical interpretation for the: a.) U (internal…

A: a) Internal energy - the energy contained in a system is the internal energy of a system. This…

Q: 12.) A 36.0 g sample of liquid water at 100.0°C is heated to 145.0 C. How much heat does the water…

A: Given: mass of liquid water = 36.0 g Initial temperature of water = 100 oC Final temperature of…

Q: 4 moles of A, (g) reacts completely with 2 moles of B, (g) to form 4 moles of A,B (g) in a constant…

A: The heat absorbed by water that raised its temperature is given as:

Q: Diamond and graphite are two crystalline forms of carbon. At 1 atm and 25°C, diamond changes to…

A:

Q: 1. Determine the amount of heat, in kJ,  released by the combustion reaction. 2. The combustion…

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Q: Estimate the standard enthalpy of formation of dichlorodifluoromethane, CCl2F2(g) (Fig. 12.20). This…

A: The reactions for the formation of CCl2F2 – Cg + 2Clg +2Fg →CCl2F2gEnthalpy of atomisation-Cs…

Q: Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum)…

A: Interpretation - To determine the mass or grams of liquid Na (minimum) which needed to absorb energy…

Q: A quantity of  3.30  ×  102 mL of 0.600 M   HNO3  is mixed with  3.30  ×  102 mL of 0.300 M…

A: Given:Concentration of HNO3 = 0.600 MVolume of HNO3 = 3.30×102 mLConcentration of Ba(OH)2 = 0.300…

Q: Using a coffee cup calorimeter, 4.02 g of ammonium chloride is added to 100g of water at 25 degrees…

A: Given: Mass of ammonium chloride i.e NH4Cl = 4.02 g Mass of water = 100 g Initial temperature of…

Q: Three moles of an ideal gas at 100 kPa pressure and 20°C are heated at constant pressure until the…

A: In this question we are asked to find the change in the enthalpy of the gas for a constant pressure…

Q: The following information is given for silicon at 1 atm: Th=2355.00°C Tm 1410.00°C Specific heat…

A: Amount of heat needed can be calculated by summation of heat needed for the individual conversions.

Q: Use Hess's law to calculate ΔG°rxn using the following information.             CO(g) →  C(s) + 1/2…

A: Record the given data, CO2(g) → C(s) + O2(g)              ΔG°rxn = +394.4 kJ CO(g) + 1/2 O2(g) →…

Q: Calculate the standard enthalpy of formation of liquid water (H2O) using the following…

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Q: How much heat (kJ) is required to convert 3.12 moles of liquid benzene at 75.1°C to gaseous benzene…

A: Heat change is the change in enthalpy (at constant pressure) associated with a chemical or physical…

Q: SPECIFIHEAT OF COMMON PURE SUBSTANCES Given the data at the left, which do you think SPECIFIC HEAT…

A: Specific heat capacity It is the amount of heat energy that must be supplied to increase the…

Q: The figure shows representations of six thermodynamic states of the same ideal gas sample. Rank the…

A: The explanation is given below-

Q: The heat required to raise the temperature from 300.0K to 400.0K for 1mole of a gas at constant…

A: This gas behaves ideally or not and is monoatomic or not has to be identified and explained.

Q: A 0.1375g sample of solid Mg is burned in a constant volume bomb calorimeter that has a heat…

A: The following relation gives the amount of heat absorbed or released by a substance. Q=mC∆T where…

Q: The heat required to raise the temperature from 300.0K to 400.0K for 1mole of a gas at constant…

A: This gas behaves ideally or not and is monoatomic or not has to be identified and explained.

Q: 12. An 1855 grams sample of water, initially at 28.6°C, was heated under a pressure of 760 Torr to…

A: Here we are required to find the amount of heat needed for water of mass 1855 g initially at 28.60C…

Q: The amount of heat absorbed or evolved when specifically one mole of the substance is produced at…

A:

Q: Use Hess’s Law to calculate ΔH(tot): [tot] 2NO2(g) + 1⁄2O2(g) → N2O5(s)       ΔH(tot) = 109.5 [1]…

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Q: You were tasked to do a simple calorimetry experiment to determine the enthalpy of reaction of HNO3…

A: Given: Concentration of HCl = 1.00 M Concentration of NaOH = 1.00 M Volume of NaOH solution added =…

Q: Choose ALL the molecules with zero standard-enthalpy-of-formation (ΔHof)=0) N2(g) H2O(g) K(s)…

A: Standard-enthalpy-of-formation (ΔHof) is the amount of enthalpy change during the formation of one…

Q: Calculate the standard enthalpy change for the reaction 2A +B= 2C+ 2D Use the following data: ΔΗ…

A: Concept:  Enthalpy of reaction: The standard enthalpy of reaction for a chemical reaction is…

Q: A quantity of 3.30 × 102 mL of 0.600 M HNO3 is mixed with 3.30 × 102 mL of 0.300 M Ba(OH)2 in a…

A: Given information:Concentration of HNO3 = 0.600 MVolume of HNO3 = 3.30×102 mLConcentration of…