The energy separation of ${ }^{12} \mathrm{C}{ }^{16} \mathrm{O}$ rotational energy levels between $\mathrm{J}^{\prime \prime}=3$ and $\mathrm{J}^{\prime \prime}=9$ is $24 \mathrm{cm}^{-1}$. The rotational constant of ${ }^{13} \mathrm{C}^{16} \mathrm{O}$ in $\mathrm{cm}^{1}$ is closest to
(a)2.98
(b)0.88
(c)1.90
(d)2.08
Answer
Answer: B ✓ checked by 4AB · confidence low
Explanation
The chapter key gives 0.88 (b). The data as printed (24 cm⁻¹ between J = 3 and J = 9 gives B(¹²CO) ≈ 0.31 cm⁻¹) do not reproduce any option, so the question is defective.