Two moles of an ideal gas is expanded isothermally

Asked by admin @ 13/08/2021 in Chemistry viewed by 381 People

Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K . The enthalpy change (in kJ) for the process is:

a) 11.4 kJ
b) -11.4 kJ
c) 0 kJ
d) 4.8 kJ

Answered by admin @ 13/08/2021

Given conditions,

No. of moles(n) = 2 moles.

Temperature(T) = 300 K.

V₂ = 10 L, and V₁ = 1 L.

Universal Gas Constant (R) = 8.31 J/moleK.

Using the formula,

Work done = -2.303nRTlog(V₂/V₁) [For Chemistry.]

∴ Work done = -2.303 × 2 × 8.31 × 300 × log(10/1)

∴ Work done = -11482.758 J.

∴ Work done = -11.483 kJ.

Now, Process is Isothermal, therefore, Internal Energy will also be zero.

Thus, Using first Law of thermodynamics (of Chemistry and not of physics)

∴ ΔU = ΔQ + w

∴ ΔQ = - w

∴ ΔQ = - (-11.483)

∴ ΔQ = 11.483 kJ ≈ 11.4 kJ.

Now, ΔQ is the enthaly because heat constant at constant pressure is enthalpy.

Hence, Option (a). is true.

Hope it helps.

2 moles of ideal gas expand isothermally and reversibly

Asked by admin @ 13/08/2021 in Chemistry viewed by 332 persons

Two moles of an ideal gas is expanded isothermally and reversibly from 1 litre to 10 litre at 300 K . The enthalpy change (in kJ) for the process is: …

Two moles of an ideal gas was compressed adiabatically

Asked by admin @ 20/08/2021 in Chemistry viewed by 363 persons

Two moles of an ideal gas (cv = 5r/2) was compressed adiabatically against constant pressure of 2 atm. Which was initially at 350k and 1atm pressure. The work involved in …

If two moles of an ideal gas at 546k

Asked by admin @ 13/08/2021 in Chemistry viewed by 351 persons

If two moles of an ideal gas at 546 k occupy a volume 44.8 liter the pressure must be

One mole of an ideal gas at 300k

Asked by admin @ 31/08/2021 in Chemistry viewed by 368 persons

one mole of an ideal gas at 300 k is expanded isothermally from an initial volume of 1 litre to 10 litres. the Î´e for this process is (r = …

During isothermal expansion of an ideal gas its

Asked by admin @ 27/08/2021 in Chemistry viewed by 315 persons

During isothermal expansion of an ideal gas, its (a) internal energy increases (b) enthalpy decreases (c) enthalpy remains unaffected (d) enthalpy reduces to zero.

One mole of an ideal gas at temperature t1

Asked by admin @ 20/08/2021 in Chemistry viewed by 320 persons

One mole of an ideal gas at temperature t1 expands according to the law

An ideal gas is expanding such that pt constant

Asked by admin @ 20/08/2021 in Physics viewed by 296 persons

An ideal gasis expanding such that pt= constant the coefficient of volume expansion of the gas will be

During isothermal expansion of an ideal gas its enthalpy

Asked by admin @ 17/08/2021 in Chemistry viewed by 338 persons

During isothermal expansion of an ideal gas, its (a) internal energy increases (b) enthalpy decreases (c) enthalpy remains unaffected (d) enthalpy reduces to zero.

2 mole of an ideal gas at 27 c

Asked by admin @ 17/08/2021 in Chemistry viewed by 329 persons

2 mole of an ideal gas at 27°C expands isothermally and reversibly from a volume of 4 litre of 40 litre. The work done (in KJ) by the gas is:

An ideal gas undergoes isothermal expansion at constant pressure

Asked by admin @ 16/08/2021 in Chemistry viewed by 287 persons

An ideal gas undergoes isothermal expansion Irreversibly at constant external pressure of 1 atm. For this process Increases

N moles of an ideal gas undergoes a process

Asked by admin @ 13/08/2021 in Physics viewed by 300 persons

N moles of an ideal gas undergoes adiabatic process and changes its state from P1,V1,T1 to P2,V2,T2 . The change in internal energy of the gas will be

During an isothermal expansion of an ideal gas its

Asked by admin @ 12/08/2021 in Chemistry viewed by 274 persons

During isothermal expansion of an ideal gas, its (a) internal energy increases (b) enthalpy decreases (c) enthalpy remains unaffected (d) enthalpy reduces to zero.

If a gas is expanded at constant temperature

Asked by admin @ 29/08/2021 in Environmental Sciences viewed by 363 persons

If a gas is expanded at constant temperature A) the pressure decreases B) the kinetic energy of the molecules remains the sameC) the kinetic energy of the molecules decreases …