The largest number of molecules among the following is -
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No. of molecules in each are as follows -
28 g of CO = 6.023 ×1023 molecules
46 g of C2H5OH = 6.023 × 1023 molecules
36 g of H2O = 12.046 × 1023 molecules
54 g of N2O5 = 3.011 × 1023 molecules
Hence no. of molecules are maximum in 36 g of H2O.