 Solution

ID: past-exam-of-the-chemistry-course-of-the-year-3-of-the-natural-sciences-course-of-the-university-of-cambridge/2021/paper-2a/section-b/21/c/iii/solution

m_{B} = 19 m_{u}

and

R = 1.5 \overset{˚}{A}

cos θ = 1 - \frac{146.588}{4 ( 19 ) ( 1.5 ) ^{2}} = 0.14276, θ ≃ 81. 8^{\circ} .

This angle is below the planar limit

9 0^{\circ}

, consistent with the proposed pyramid. The sulfur mass does not enter this axial moment of inertia.

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