i) The molar mass of silver is 107.9 g/mol.(rounding to 108). As 1 mole = 6.023 x 10^23 molecules (Avogadro's number), 108 g of Silver contains 6.023 x 10^23 molecules. So, mass of 1 atom of silver = 108 / 6.023 x 10^23 = 1.7931 x 10^-22 g.Therefore the answer is =107.9 g/mol.

ii) Mass of 1 molecule of Naphthalene = 10× mass of carbon + 8× mass of hydrogen =>10×12 + 8×1=120+8= 128 g.

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