A mole of ideal gas undergoes a twostep reversible process (AB and BC). The pressure at points A and C is the same. Select the correct statement:
Question
A mole of ideal gas undergoes a twostep reversible process (AB and BC). The pressure at points A and C is the same. Select the correct statement:
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Answer
The correct answers are: C and D.
Calculations:

Determining Volume at Point ( A ):
$$ V_{A} = \frac{nRT_{A}}{P_{A}} $$
Given:
 ( n = 1 ) mole
 ( R = 0.0821 ) L·atm·K(^{1})·mol(^{1})
 ( T_{A} = 100 ) K
 ( P_{A} = 1 ) atm
Therefore:
$$ V_{A} = \frac{1 \times 0.0821 \times 100}{1} = 8.21 \text{ L} $$

Determining Volume at Point ( B ):
$$ V_{B} = \frac{nRT_{B}}{P_{B}} $$
Given:
 ( T_{B} = 600 ) K
 ( P_{B} = 3 ) atm
Therefore:
$$ V_{B} = \frac{1 \times 0.0821 \times 600}{3} = 16.42 \text{ L} $$

Comparing Volumes ( V_{B} ) and ( V_{A} ):
Since ( V_{B} > V_{A} ), expansion occurs.

Volume at ( B ) in liters:
$$ V_{B} = 16.42 \text{ L} $$
Conclusion:
 C: The volume increases, indicating an expansion.
 D: The volume at point ( B ) is ( 16.42 ) liters.
Hence, the correct answers are C and D.
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