SATHEE: Thermodynamics Question 135

Thermodynamics Question 135

Question: One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from $0^{o} C$ to $100^{o} C$ . Then the change in the internal energy is

[Pb. PMT 2001]

Options:

A) 6.56 joules

B) $8.32 \times 10^{2}$ joules

C) $12.48 \times 10^{2}$ joules

D) 20.80 joules

Show Answer

Answer:

Correct Answer: C

Solution:

Change in internal energy is always equal to the heat supplied at constant volume. i.e.

$Δ U = {(Δ Q)}_{V} = μ C_{V} Δ T .$

For monoatomic gas $C_{V} = \frac{3}{2} R$

Therefore $Δ U = μ (\frac{3}{2} R) Δ T = 1 \times \frac{3}{2} \times 8.31 \times (100 - 0)$

$= 12.48 \times 10^{2} J$

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Thermodynamics Question 135

Question: One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from 0oC to 100oC . Then the change in the internal energy is

Options:

Answer:

Solution:

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Question: One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from $0^{o} C$ to $100^{o} C$ . Then the change in the internal energy is