$2$ mole of $N_2$ gas at $27\,^oC$ is mixed with $1$ mole $He$ gas at $-73\,^oC$. Find $T_{mix}$ of the mixture
  • A$277\,^oC$
  • B$277\,K$
  • C$5\,^oK$
  • D$50\,^oC$
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