4. The combustion of 1.00 mol of liquid octane (C,H13), a component of gasoline, at constant pressure ir excess oxygen is exothermic, producing 5.46 × 10° kJ of heat. (1) Write the thermochemical equation for this reaction. (2) What is the enthalpy change for burning 50.0 g of octane?

Q: A gas expands and does P-V work on the surroundings equal to 294 J. At the same time, it absorbs 246…

A: The first law of thermodynamics states that the change in internal energy of a system equals the net…

Q: What is the change in the internal energy of a system that absorbs 2,500 J of heat and that does…

A: The given data contains, A System absorbs 2500 J of heat work =7655 J

Q: When methanol, CH,OH, is burned in the presence of oxygen gas, 0,, a large amount of heat energy is…

A:

Q: What is the change in internal energy

A:

Q: If a student performs an endothermic reaction in a calorimeter, how does the calculated value of ∆H…

A: An endothermic reaction is the one that takes in energy, overall.

Q: Suppose we have a closed, un-isolated system. When 483 J of heat was introduced to the system, it…

A: Internal energy is a state function. The symbol used for internal energy is U. The unit used for the…

Q: Consider the following reaction equation of combustion of glucose, C6H12O6: a. Calculate the…

A: Mass of Glucose = 5.25 g C6H12O6 (s) + 6O2(g) ------> 6CO2(g) + 6H2O(g)

Q: The combustion of hydrogen-oxygen mixtures is used to produce very high temperatures (ca. 2500 °C)…

A: In the given question we have to calculate the quantity of heat evolved in kilojoules when equal…

Q: 9. The evaporation of water is endothermic: H2O (1) → H2O (g) AH°rxn = 44.01 kJ/mol What minimum…

A: H°rxn = 44.01 kJ / mol

Q: Calculate the change in the internal energy for a process inwhich a system absorbs 140 J of heat…

A: The relationship between the change in internal energy, heat absorbed and work done on the system is…

Q: A gas expands and does work on the surroundings equal to 279 J. At the same time, it absorbs 216 J…

A: Note : Since you have posted multiple questions, we are entitled to answer the first only. Please…

Q: Describe how chemists use Hess’s law to determine the ΔH°f of a compound by measuring its heat…

A: To find: How the Hess's law used to determine the ΔH°f of a compound by measuring its heat…

Q: When 2.0 g of CaO is added to 50.0 mL of water at 25.0 °C in a calorimeter, the temperature of the…

A: The reaction taking place is given as, => CaO (s) + H2O (l) --------> Ca(OH)2 (aq) Given :…

Q: What is the internal energy of a system that has 45.2 J of work done to it and releases 74.6 J of…

A: Given, work done on system ,W = 45.2 J Heat released from system to sorroundings, q  = 74.6 J

Q: In an experiment, a 0.8068 g sample of phthalic acid (C8H6O4) is burned completely in a bomb…

A: The number of moles of phthalic acid present in the experiment can be calculated as,

Q: When a 0.740-g sample of trinitrotoluene (TNT), C,H,NO, is burned in a bomb calorimeter, the…

A: Dear student , since you have posted multiple questions we will allow to solve only first question…

Q: Propane is a common fuel used in portable stoves. If a gas canister contains 0.283 dm3 of propane,…

A: Given, C3H8 (g) + 5 O2 (g) ➝ 3 CO2 (g) + 4 H2O (g)              ∆H = -2221KJ/mol Here, (-) sign…

Q: When methanol, CH,OH, is burned in the presence oxygen gas, 0, a large amount of heat energy is…

A: A chemical reaction is symbolic representation of the conversion of substances to new substances. In…

Q: 3. This reaction: CHalg) + 20(g) CO(g) + 2H;O1) produces 56.0 kJ of heat when 1.00 g of methane is…

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

Q: 2. What is the heat capacity of 25.0 g of ethyl alcohol if its specific heat is 2.42 J/g C?

A: Given is 25.0 g ethyl alcohol  Heat capacity  = Hc = 2.42 J/g°C Specific heat = ?

Q: A sample of tin experiences a cemperature change of +60.8 PC while absorbing 672.1 joules of heat.…

A: Specific heat capacity is amount of heat needed to increase the temperature of one gram of substance…

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 1.36 kg sample…

A: Given: Mass of sampleC4H6O2=1.36 kg T1=48.6οC T2=61.7οC Q=2.79×104 J To find: Molar heat capacity…

Q: 4-A system suffers an increase in internal energy of 80 J and at the same time has 50 J of work done…

A:

Q: What is the change in energy (in J) for a system that lost 344 J of heat to the surroundings, and…

A: Assume that work (w) is done on the system, so w will be positive.Given:Heat lost, Q  = - 344 JWork…

Q: Calculate the heat capacity (in J/C) of 20.0 mL of room temp. water given that the specific heat…

A: Heat capacity of a material for a particular mass = Specific heat capacity  mass of the material

Q: A gas expands and does P-V work in the surroundings equal to 279 J. At the same time, it absorbs…

A:

Q: If the water in a coffee cup calorimeter absorbed 300 J of energy (q = +300 J) during a reaction…

A: Energy absorbed by water in coffee cup calorimeter = 300 J qwater = + 300 J

Q: Which statement is true of the internal energy of the system andits surroundings following a process…

A: The change internal energy is positive that is ∆Esys=+65 kJ.

Q: Im having trouble finding J*mol^-1*K^-1.

A: The given temperature in Kelvin scale can be written as follows,-9oC = 264.15 K11.3oC = 284.45…

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 1.51 kg sample…

A:

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 0.54 kg sample…

A:

Q: 1)What is the specific heat if 24.8 g of a metal absorbs 275 J of energy and the temperature rises…

A:

Q: When a 12.8 g sample of NaOH(s) dissolves in 360.0 mL water in a coffee cup calorimeter, the…

A:

Q: In an experiment, 28.0 g of metal was heated to 98.0°C and then quickly transferred to 150.0 g of…

A:

Q: Combustion reactions involve reacting a substance with oxygen When compounds containing carbon and…

A: The reaction taking place is given as, => C2H2 (g) + 2 H2 (g) ------> C2H6 (g) Given : Heat of…

Q: 1. Given that AH°,( BaSOle) = -1,473 KJ/mol, using the given table, what is standard enthalpy change…

A: Given reaction is :  Ba2+ (aq) + SO42- (aq)---------> BaSO4 (s)  Enthalpy of formation of BaSO4…

Q: Dimethyl ether, a useful organic solvent, is prepared in two steps. In the first step, carbon…

A:

Q: What is the change in molar enthalpy of N, when it is heated from 25°C to 100°C? Use the heat…

A:

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 0.19 kg sample…

A:

Q: In a calibration of a calorimeter, 50.3 g of water at 60.5 degrees C is added to 48.7g of water at…

A: GivenMass of 1st lot of water = 50.3gTemperature (T1) = 60.5°CMass of 2nd lot of water =…

Q: 1. Why is it necessary to indicate the physical state of all reactants and products when giving the…

A: Enthalpy change of the reaction (ΔHrxn) is the amount of energy change during a chemical reaction.

Q: If a student performs an endothermic reaction in a calorimeter, how does the calculated value of ΔH…

A:

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 1.76 kg sample…

A: To find molar heat capacity.

Q: When a 13.3 g sample of NaOH(s) dissolves in 386.0 mL water in a coffee cup calorimeter, the…

A:

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: When a 13.3 g sample of NaOH(s) dissolves in 394.0 mL water in a coffee cup calorimeter, the…

A:

Q: The reaction of zinc with hydrochloric acid is represented by the reaction Zn(s) + 2 HCl(aq) ↔ ZnCl…

A: Q = m . s . (T2 - T1) Where, Q = heat absorbed/liberated, m = mass of substance, s = specific heat…

Q: -. The contents of the closed box in each of the following illustrations represent a system, and the…

A: Since numerical values of w or Q are not given, we have to use sign convention to find the sign of…

Q: What is the heat energy required to raise the temperature of 5 grams of lead from 10 ̊C to 15 ̊C?

A: q = mc∆T  q is the amount of heat energy required  m is the mass of lead c is the specific heat…

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.