A reaction released 1256 J of heat and expands from 1.3L to 14.7L at a constant...

A reaction released 1256 J of heat and expands from 1.3L to 14.7L at a constant pressure of 1.04 kPa. What is the total energy change for the system in kJ. Include the correct sign with respect to the system. (1 kPa * L = 1 J)

Expert Solution

The amount of heat released , Q = -1256 J

Work done by the system , W = - PdV

= -1.04 kPa x ( 14.7 - 1.3) L

= - 1.04 x 13.4 KPa L

= - 13.9 J

From first law of thermodynamics Q = dE + W

Here dE = change in internal energy = ?

dE = Q - W

= -1256 -(-13.9) J

= -1242.1 J

queen_honey_blossom answered 1 month ago

A balloon is heated by adding 1000 J of heat. It expands by about 5 liters...

A balloon is heated by adding 1000 J of heat. It expands by about 5 liters against a constant atmospheric pressure of 1 atm. Calculate the change in the internal energy of the system.

1.A cloud expands 7.12 m3 at 2.65E5 Pa while absorbing 5.11E6 J of heat. What is...

1.A cloud expands 7.12 m3 at 2.65E5 Pa while absorbing 5.11E6 J of heat. What is its change in internal energy? 2.A 258 g block of 474°C iron (c=.450) is dropped onto a large block of 0.00°C ice (l=334 J/g). How much of the ice melts? 3.An ideal heat pump needs 261 J of work to push 879 J of heat into your 77.1°C house. What is the temperature outside? (in Kelvin)

A reaction takes place in a balloon such that 425 J of heat are taken in...

A reaction takes place in a balloon such that 425 J of heat are taken in from the surroundings and 193 J of work are done by the surroundings. What is ΔE for the system? in J What is ΔH for the surroundings? in J What is ΔE for the universe? in J

For the reaction: 2A + B2 -> 2AB,+ H =+50.0 kJ a) Heat is released to...

For the reaction: 2A + B2 -> 2AB,+ H =+50.0 kJ a) Heat is released to the surroundings b) The standard enthalpy of formation for AB is 50.0 kJ c) The molecule AB contains less energy than A or B2 d) The reaction is endothermic e) The bond energy for each A-B bond is 50.0 kJ

Suppose that 300.0 J of heat is transferred by conduction from a heat reservoir at a...

Suppose that 300.0 J of heat is transferred by conduction from a heat reservoir at a temperature of 415.0 K to another reservoir. Calculate the entropy change if the temperature of the second reservoir is 100.0 K

8.2 Kj of heat is added to a system that expands from 3.00L to 6.00L against...

8.2 Kj of heat is added to a system that expands from 3.00L to 6.00L against 3.5 atm of pressure. Compute the delta E

For a given reaction, the heat capacity (CP) of the reactants is 50.0 J/mol K and...

For a given reaction, the heat capacity (CP) of the reactants is 50.0 J/mol K and for the products is 65.0 J/mol K. If the enthalpy of reaction is − 150.0 kJ/mol at 300K, what is the best estimate of ΔrxnH at 320K? The reaction in the previous question is carried out adiabatically starting at 300 K. What is the final temperature after the reaction goes to completion? ΔrxnH300 = -150.0 kJ/mol CP(reactants) = 50 J/molK CP(products) = 65 J/molK...

The heat capacity, CP, of liquid carbon disulfide is a relatively constant 78 J/(mol·K). However, the...

The heat capacity, CP, of liquid carbon disulfide is a relatively constant 78 J/(mol·K). However, the heat capacity of solid carbon disulfide varies greatly with temperature. From 75 K to its melting point at 161 K, the heat capacity of solid carbon disulfide increases linearly from 39 J/(mol·K) to 57 J/(mol·K). The enthalpy of fusion of carbon disulfude is ΔHfus = 4390 J/mol. The absolute entropy of liquid carbon disulfide at 298 K is S = 151 J/(mol·K). Estimate the...

The molar heat capacity for carbon monoxide at constant volume is CV,m = 20.17 J/(K·mol). A...

The molar heat capacity for carbon monoxide at constant volume is CV,m = 20.17 J/(K·mol). A 16.00-L fixed-volume flask contains CO(g) at a pressure of 2.00 kPa and a temperature of 25.0 °C. Assuming that carbon monoxide acts as an ideal gas and that its heat capacity is constant over the given temperature range, calculate the change in entropy for the gas when it is heated to 800.0 °C. delta S= _____J/K

For liquid benzene at 25 ̊C, the specific heat at constant pressure is 1.78 J K-1...

For liquid benzene at 25 ̊C, the specific heat at constant pressure is 1.78 J K-1 g-1, the density is 0.88 g cm-3, the coefficient of thermal expansion is 0.00124 K-1, and the isothermal compressibility is 9.8x10-5 atm-1. Calculate the molar heat capacity of benzene at 25 ̊C, at constant pressure and at constant volume.

Question