$K_p$ for the reaction $2SO_3 \rightleftharpoons 2SO_2 + O_2$ at $700 \ K$ is $1.3 \times 10^{-3} \ atm$. The $K_c$ at the same temperature for the reaction $2SO_2 + O_2 \rightleftharpoons 2SO_3$ will be:

  • A
    $1.1 \times 10^{-2}$
  • B
    $3.1 \times 10^{-2}$
  • C
    $5.2 \times 10^{-2}$
  • D
    $7.4 \times 10^{-2}$

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Explain why the partial pressure $p$ of a gas is proportional to its concentration $c$.

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