The First Law of Thermodynamics, known as Conservation of Energy, states that when energy is transformed, the total stays the same. Describe TWO examples of the first law, one involving living organisms and one not involving living organisms.

Q: An unknown sample of coal is burned in an apparatus with a calorimeter constant of 2.44 kJ/°C. When…

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Q: Consider the following chemical reaction which produces HCI from its constituent elements: H2 (g) +…

A: The correct option with explanation is provided in the next step:

Q: 2. Cold packs take advantage of the fact that dissolving NH4NO3 in water is an endothermic process.…

A: Mass of solid, NH4NO3(s) taken = 5.44 g  Initial temperature, Ti = 18.6 oC  Mass of water taken =…

Q: A 115.0-g sample of a metal at 165.0 °C is added to 265.0 g of ethylene glycol (specific heat = 2.43…

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Q: A student heats 84.17 mL of water to 95.27°C using a hot plate. The heated water is added to a…

A: Heat capacity : heat capacity, ratio of heat absorbed by a material to the temperature change. It is…

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 chemist carefully measures the amount of heat needed to raise the temperature of a 0.53 kg sample…

A: We know that  Q = m*s*ΔT        ----------(1) Where, Q is heat energy               m is mass of…

Q: Consider the following reactions:                  C2H6 (g)  +  7/2 O2 (g)  →  2 CO2 (g)  +  3 H2O…

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Q: 3. When a student mixes 50 mL of 1.0 M HCI and 50 mL of 1.0M NaOH in a coffee- cup calorimeter, the…

A: given - 50 ml of 0.1 HCl  50 ml. of 0.1 NaOH density = 1 g/ml specific heat = s = 4.18 J/g K initial…

Q: Using the data given in this question, find the amount of energy needed to break down (decompose)…

A: Energy required = number of moles of Oxygen x ΔH/stoichiometric coefficient of oxygen   Number of…

Q: 5) A 120.0-g piece of metal at 60.0 °C is placed in 150 g of water at 19.0 °C contained in a…

A: Calculating the heat released or absorbed for the process:            ......(1) In a system, the…

Q: If 4.168 kJ of heat is added to a calorimeter containing 75.40 g of water, the temperature of the…

A: Given,  Amount of heat added to a calorimeter = 4.168 KJ  Mass of water = 75.40 g  Initial…

Q: A coal-burning power plant generates electrical power at a rate of 450 megawatts (MW), or 4.50 x 108…

A: Heat is that energy which is transferred from one body to another which creates difference in…

Q: What is the enthalpy change in kJ of a chemical reaction that raises the temperature of 250.0 mL of…

A: We have to calculate the enthalpy change

Q: Which of the following processes is an endothermic process that absorbs the least amount of heat as…

A: The given processes are  Li+(g) + F- (g) → LiF (l) Mg2+(g) + S2- (g) → MgS (s) Mg2+(g) + O2- (g) →…

Q: The combustion of 0.1584 grams of benzoic acid increases the temperature of a calorimeter by 2.54 C.…

A: Heat capacity is given by,

Q: A fuel was used to heat water in a calorimetry experiment. When butane was burnt, 96070.0 J of heat…

A: Ans is given below

Q: When 1 mole of 12(g) reacts with Cl₂(g) to form ICI(g) according to the following equation, 26.8 kJ…

A: Recall the given equation,                                I2 g  +  Cl2 g  →  2 ICl gWhen 1 mole of…

Q: Silane, SiH4, burns according to the reaction, SiH4 + 2O2 → SiO2 + 2H2O, with ΔH° = –1429 kJ. How…

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Q: 2. An 88.5 gram piece of iron initially at 78.8°C is place in a beaker containing 244 grams of water…

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Q: A 2.15-gram raw cashew nut is burned. The heat released raises the temperature of a 100.0-gram…

A: Given : Mass of water = 100.0 g Mass of cashew = 2.15 g Initial temperature of water = 18.2 oC Final…

Q: When sulfuric acid dissolves in water, a great deal of heat is given off. The enthalpy change for…

A: Answer:-This question is answered by using the simple concept of calculation of heat released using…

Q: Calculate enthalpy of reaction given reaction enthalpies for proposed steps in a process. K+(g) +…

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Q: Which one of the following statements is true? Enthalpy is a state function. The enthalpy change of…

A: Statement I : Enthalpy is state function.                   It is true because we can calculate…

Q: When 14.2 g KBr is dissolved in 100.0 g of water in a coffee-cup calorimeter, the temperature drops…

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Q: Use the data provided to find the enthalpy change for the following reaction, by applying Hess's…

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Q: The heat capacity of an object depends on its mass and its composition. The heat capacity of one…

A: Specific heat is the amount of heat required to produce a change of 10C in exactly 1 g of substance.…

Q: 1. A thermometer placed in a solution undergoing a chemical reaction indicates an increase in…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A piece of metal with a specific heat of 1.153 J/gºC is heated to 124.6ºC and then placed in 120.382…

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