1 mole ideal gas at 350 K is in a 2.0L vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes expansion isothermally from 2.0 L to 3.0 L against a constant pres

Question

1 mole ideal gas at 350 K is in a 2.0L vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes expansion isothermally from 2.0 L to 3.0 L against a constant pressure of 4 atm.  is   (Nearest integer).
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Canvas Classes · Accepted Answer

Strategy:
 The change in entropy of surroundings () is calculated using the heat exchanged with the surroundings: .

Step 1: Calculate work done BY the gas
Expansion against constant pressure:
.
.

Step 2: Find heat absorbed by surroundings
For isothermal ideal gas, .
Heat flows from surroundings into system: .

Step 3: Calculate 
.
Magnitude rounded to nearest integer is often used in context; here it is roughly . If using reversible heat context (maximum work):
.
 (matching standard JEE key ou

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