Calculate the number of normal modes of vibration for the following compounds:

(i) H₂O 

(ii)  CH₄

(iii) HBr

To calculate the number of normal modes of vibration for each compound:

(i) H₂O (Water)
Water has three atoms (two hydrogens and one oxygen). The formula to determine the number of vibrational modes is 3N−63N - 6, ___ ________ __________ _____ ____.
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