Questions 123 – 125 relate to a heat engine which uses heat to do 50 J of work, and then exhausts 100 J of energy into a cold reservoir 122. A. 150 J B. 100J C. 50 J D2 J The heat added to the heat engine is 123. The efficiency of the heat engine is A. 25% B. 33% C. 50% D. 75%

Q: Part 4: Hess's Law a. Mass of NaOH dissolved (g) 0.3434 b. Mass of calorimeter (g) c. Mass of…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: A piece of metal with mass 20.00 g at room temperature [25.0oC] was heated up to 90.0oC. This metal…

A: a) The amount of heat water gained is given by Q as Q = mCΔT where m = mass of water = density X…

Q: A piece of calcite is heated to 72.0°C and placed in a styrofoam coffee cup containing 25.0 mL of…

A: GIVEN: The temperature of Calcite=72.0°C Volume of water= 25.0 mL The initial temperature of water=…

Q: Determine the amount of heat needed to raise a piece of metal 54.8 K. The piece of metal has a mass…

A:

Q: An automobile engine provides 623 Joules of work to push the pistons. In this process the internal…

A: Given: Work done = 623 Joules Change in internal energy = -2731 Joules

Q: An automobile engine provides 561 Joules of work to push the pistons. In this process the internal…

A: To solve this question, use the formula which contains q, ∆U, and w in it. Give the signs to the…

Q: A 8.79 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: An automobile engine provides 556 Joules of work to push the pistons. In this process the internal…

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Q: Which of the following processes will release the most energy?    Cl2(g) ⟶⟶ 2Cl(g)        Br2(g) ⟶⟶…

A: We have to indentify the most energy released process among the given options .

Q: Calorimeter Y has a greater heat capacity than Calorimeter Z. What does this imply? Select one: O a.…

A: Given heat capacity of calorimeter Y is greater than calorimeter Z

Q: Which of these processes releases the largest amount of energy? (A) F + e– --> F–;…

A:

Q: The system absorbs 88 J of energy as it does 42 J of work. * Calculate the change in energy for the…

A: Given: System is absorbing 88 J of energy and doing 42 J of work.

Q: Predict the effect of decreasingthe temperature on theamounts of reactants in the following…

A: Temperature is the factor that affects the rate of the reaction. Temperature effect depends on the…

Q: An automobile engine provides 621 Joules of work to push the pistons. In this process the internal…

A: According to the first law of thermodynamics, the following expression is obtained: ∆U=q+w…

Q: When 47.1 J of heat is added to 13.2 g of a liquid, its temperature rises by 1.75 ° C. You may want…

A: The heat capacity of a substance is defined as the heat required to raise the temperature of one…

Q: A beaker contained 70.57 g of water at 18.04°C. A 84.49-g sample of metal at 75.65°C was placed in…

A:

Q: Which term is not correctly matched? botue (a) endothermic - energy is absorbed (b) exothermic –…

A:

Q: The specific heat capacity of a pure substance can be found by dividing the heat needed to change…

A: Given - Heat capacity of the substance = 4.78Jg.°C            Mass of the substance = 189 g…

Q: Which of these descriptions of heat energy is not correct?a. Heat energy flows between objects that…

A: Thermodynamic is the branch of chemistry that mainly deals with the heat transfer between system and…

Q: An automobile engine provides 549 joules of work to push the pistons. In the process the internal…

A:

Q: LP gas burns according to the exothermic reaction:C3H8(g) + 5 O2(g) -------->3 CO2(g) + 4…

A:

Q: Aluminum metal reacts with chlorine with a display of sparks: 2 Al(s)  +  3 Cl2(g)  ➜  2 AlCl3(s)…

A: In the given reaction, 2 Al(s) + 3 Cl2 (g) ➜ 2 AlCl3 (s) ΔH = –1408 kJ

Q: 3. 36,144J is needed to change 4 kg of substance from 12 °C to 30°C, what is the substance? Show…

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Q: (5) Consider the reaction: 2H2(g) + O2(g) → 2H₂O(1) The heat produced (KJ) to produce 1.0 mole of…

A: Mole is a standard unit for measuring large quantities of very small entities such as molecules,…

Q: An automobile engine provides 628 Joules of work to push the pistons. In this process the internal…

A: According to first law of thermodynamics , energy can neither be created nor destroyed it can change…

Q: A chemist measures the energy change AH during the following reaction: Cl,(9)+ H,(9) – 2 HC(9)…

A:

Q: A pyrex glass flask is filled with 200 g of water. The energy required to heat the system (the flask…

A:

Q: Water (2290 gg ) is heated until it just begins to boil. If the water absorbs 5.15×105 JJ of heat in…

A: Mass of water = 2290g.Heat absorbed by water = 5.15*105J.Boiling temperature of water =…

Q: An automobile engine provides 613 Joules of work to push the pistons. In this process the internal…

A:

Q: A beaker contained 69.68 g of water at 15.25°C. A 81.2-g sample of metal at 52.22°C was placed in…

A: Given that : The mass of water (mw)= 69.68 g Temperature of water = 15.25°C The mass of sample (mm)…

Q: An automobile engine provides 565 Joules of work to push the pistons. In this process the internal…

A: In this question, we want to determine the amount of heat that must be carried away by the cooling…

Q: A 8.17 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee…

A: Weight of a compound divided by its molecular mass (MM) gives the moles of the compound.

Q: An automobile engine provides 624 Joules of work to push the pistons. In this process the internal…

A: Calculate heat q for the engine ?

Q: A 100.0-g bar of gold is heated from 25 °C to 50 °C during which it absorbs 323 J of heat. Assume…

A: Given, the mass of gold bar m =100.0 ginitial temperature T1 =25 °C =(25+273)K =298 Kfinal…

Q: Al is heated to 100 oC and dropped into a 100 gram glass beaker that contains 200 grams of H2 The…

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Q: I. Matching Type 1. energy at motion a. Potential energy b. Second law of 2. Energy is neither…

A:

Q: An automobile engine provides 623 Joules of work to push the pistons. In this process the internal…

A: According to the first law of thermodynamics, the energy of the universe remains constant. For a…

Q: 9) The standard heat of combustion of ethanol, C,I ethanol. How much heat (in kJ) would be liberated…

A: We will use unitary method to get the answer

Q: The specific heat of aluminum is 0.214 cal/g.°C. Determine the energy, in calories, necessary to…

A:

Q: elect the ???? description about the second law of thermodynamics. *       A. Measure of the…

A: Second law of thermodynamics is given because as per first law energy can be converted from one form…

Q: 2

A: Thermodynamic is the branch of chemistry that mainly deals with the heat transfer between system and…

Q: An automobile engine provides 617 Joules of work to push the pistons. In this process the internal…

A:

Q: Nitrogen gas and oxygen gas can combine to form nitrogen monoxide gas. Nitrogen monoxide gas can…

A: Energy taken for the reaction N + O2 ----> NO2 Is equals to the to energy taken by the two…

Q: 41. If 2 moles of diatomic gas kept at a volume of 20 liters and is compressed from 2 atmospheres of…

A:

Q: An automobile engine provides 633 Joules of work to push the pistons. In this process the internal…

A: From first law of thermodynamics, we know :  ∆U = q + w Where ∆U = Change in internal energy. q =…

Q: A 45.90 g sample of pure copper is heated in a test tube to 99.40°C. The copper sample is then…

A: Given: Mass of water = 61.04 g Initial temperature of water (Ti) = 24.39 ℃ Mass of Cu = 45.90 g…

Q: An automobile engine provides 585 Joules of work to push the pistons. In this process the internal…

A:

Q: 2. A 4.348 g sample of NaOH(s) is dissolved in 100. g of water in a calorimeter, the temperature…

A: In this question we have to calculate the heat of Reaction by the given data of the calorimeter.

Q: An automobile engine provides 572 Joules of work to push the pistons. In this process the internal…

A:

Q: A beaker contained 65.35 g of water at 13.85°C. A 105.41-g sample of metal at 54.71°C was placed in…

A:

Designing a Synthesis

Organic synthesis is a branch of chemical synthesis that involves the planned construction of organic compounds/molecules from smaller units that possess functional groups. Friedrich Wöhler was the first scientist who designed the synthesis of an organic compound, urea from inorganic starting materials silver cyanate with ammonium chloride via a simple, one-step synthesis.