Calculate DE, and determine whether the process is endothermic or exothermic for the following cases:

Q: 100 mL of water at 100.0°C were placed in an insulated cup. 100.0 g of copper shot initially at room…

A:

Q: Methanol (CH3OH) is also known as wood alcohol and can be used as a fuel. When one mole of methanol…

A: When one mole of methanol is burned, 1453 kJ of heat are evolved. Means ; 1 mole methanol = 1453 KJ…

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

A:

Q: When 0.395 g of sodium metal is added to an excess of hydrochloric acid, 4110 J of heat are…

A: Given: Weight of sodium metal is 0.395 g Heat produced is 4110 J The given reaction is,…

Q: A student wishes to measure the enthalpy change of the reaction of magnesium oxide solid (MgO, M=…

A:

Q: Calculate DE, and determine whether the process is endothermic or exothermic for the following…

A: Given  (a) Absorb heat by the system = 334 KJ       Work done on the system   = 147 KJ       ∆E = ?…

Q: If AH = -54.74 kJ for a chemical reaction, that reaction O is endothermic cannot occur is exothermic

A: In endothermic reaction heat is require while in exothermic reaction heat is given off.

Q: Consider the following reaction A(s) → B(s)+ C(g) AH= 80. 89 kJ/mol (a) What is AH for the reverse…

A: a= Δ H =-80.89     unit  =  kJ as in reverse direction only the sign changes   b.for 1 mol it is…

Q: A piece of metal weighing 59.047 g was heated to 100.0°C. This metal is placed in 100.0 g of water…

A: The heat of the substance is arisen due to a change in the temperature of the system. The heat of…

Q: A 15.0 gram lead ball at 25.0°C was heated with 40.5 joules of heat. Given the specific heat of lead…

A: The change in temperature of the lead ball can be calculated by equation (1). where q is the heat…

Q: (Q3) How much heat (in J) is required to raise the temperature of a block made of pure copper was a…

A: Mass=6.98g   Change in Temperature=6.01°C

Q: In a calorimeter, a 90.0 g piece of metal at 92.4 *C is submerged in 100.0 g of water, that is…

A: In a calorimeter, a 90.0 g piece of metal at 92.4 °C is submerged in 100.0 g of water that is…

Q: repair crews to weld rails together. -) Ⓡ 2Fe(s) + Al2O3(s) DH rxn= -850 kJ -n, in grams, is formed…

A: Exothermic process is the one in which energy is liberated from the system to the surrounding in the…

Q: A 0.2 gram sample of a candy bar is com- busted in a bomb calorimeter, increasing the temperature of…

A: Given :  Initial temperature of water = 25.00 °C  Final temperature of water = 25.47 °C  Mass of…

Q: In a given gaseous reaction, 72 J of heat is absorbed and AE = -442 J. (a) Calculate w (work). work…

A: First law of thermodynamics  When heat absorbed by a system  Q=∆E+W Q=heat absorbed by a system…

Q: Use the References to access important values if needed for this question. The following…

A: Iron (III) oxide reacts with hydrogen to form iron metal and water. The equation for the balanced…

Q: How much heat energy would be needed to raise the temperature of a 32.0g sample of gold [ C= 0.129(…

A: Given: The mass of sample of gold, ‘m’ is 320 g The specific heat of gold, ‘c’ is 0.129 J/goC The…

Q: Which of the following which is/are true about the internal energy, E?   (i) The total energy of…

A: Internal Energy is defined as energy dissociated with the random, disordered motion of Molecules.

Q: Enthalpy is the energy absorbed or released when a chemical change occurs. Assume you have the…

A: Heat evolved when, 1 mole of the substance is completely burnt in presence of oxygen is known as…

Q: 1. (Heat) The combustion of 0.0222 g of isooctane vapor, C3H18(g), at constant pressure raises the…

A:

Q: 3. A piece of copper metal is initially at 100.0°C. It is dropped into a coffee cup calorimeter…

A:

Q: A student heats 63.74 grams of nickel to 98.87 degree celcius and then drops it into a cup…

A: heat capacity formula : Q =m*c*△T Q = heat energy m = mass  c = specific heat capacity  △T =…

Q: A 39 g aluminum spoon (specific heat 0.904 J/g-°C) at 25°C is placed in 178 mL (177 g) of coffee at…

A: A definite quantity of heat is used up in raising temperature of substances. For substance that…

Q: Calculate the heat needed, in joules, to raise the temperature of 34 g iron, Fe, from 25oC to 78oC.…

A: The amount of heat absorbed (or released) by fixed amount of a substance to change its temperature…

Q: When thermal energy is transferred from the system to its surroundings, heat (q) is:

A: When thermal energy is transferred from the system to its surroundings, heat (q) is negative  It is…

Q: Calculate the kinetic energy of a 1401 kg vehicle travelling at 96.6 km/h. Ex= kJ

A:

Q: A 319−g aluminum engine part at an initial temperature of 11.47°C absorbs 61.0 kJ of heat. What is…

A:

Q: A 387−g aluminum engine part at an initial temperature of 15.91°C absorbs 88.2 kJ of heat. What is…

A: The amount of heat required is related to specific heat capacity as,…

Q: The Aq of a system that releases 12.4 J of heat to surroundings is O 12.4 J O -12.4 J Not enough…

A: The objective of the question is to determine the change in heat (Δq) of a system that releases 12.4…

Q: What is the Kinetic energy of a 2000-Ib car traveling at 59 miles per hour? (Ib =0.4536 kg, 1 mi=…

A: The Kinetic energy of a 2000-lb car traveling at 59 miles per hour is calculated as,1lb =0.4536…

Q: ,11) [References) Use the References to access important values if needed for this question. In the…

A: