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Question: Answered & Verified by Expert
If 4 moles of an ideal monoatomic gas at temperature $400 \mathrm{~K}$ is mixed with 2 moles of another ideal monoatomic gas at temperature $700 \mathrm{~K}$, the temperature of the mixture is
PhysicsThermodynamicsTS EAMCETTS EAMCET 2004
Options:
  • A $550^{\circ} \mathrm{C}$
  • B $5000^{\circ} \mathrm{C}$
  • C $550 \mathrm{~K}$
  • D $500 \mathrm{~K}$
Solution:
2455 Upvotes Verified Answer
The correct answer is: $500 \mathrm{~K}$
Temperature of the mixture
$$
\begin{aligned}
T & =\frac{m_1 T_1+m_2 T_2}{m_1+m_2} \\
& =\frac{4(400)+2(700)}{4+2}=500 \mathrm{~K}
\end{aligned}
$$

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