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Chemical Bonding And Molecular Structure
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The total number of molecules with zero dipole moment among \(\mathrm{CH}_4, \mathrm{BF}_3, \mathrm{H}_2 \mathrm{O}, \mathrm{HF}, \mathrm{NH}_3, \mathrm{CO}_2\) and \(\mathrm{SO}_2\) is ________.