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The zero-point energy of the vibration of ³⁵Cl₂ mimicking a harmonic oscillator with a force constant k = 2293.8 N/m is ...

A. 10.5 x 10⁻²¹ J
B. 14.8 x 10⁻²¹ J
C. 20.9 x 10⁻²¹ J
D. 20.6 x 10⁻²¹ J