what is the mass of 18 moles of water and what is the mass of 18 molecules of water??

Mass of 1 mole of water(H2O) = 1×2 + 16×1 = 18g = 0.018 kgSo, the mass of 18 moles of water(H2O) = 18×18g = 324g = 0.324 kg1 mole has 6.023×10^23 units (here molecules)*Avogadro`s Number = 6.023×10^23So, 18 molecules of H2O = 18÷(6.023×10^23) moles of H2OTherefore mass of 18 molecules of water (H2O) = no. of miles × mass per mole = 18÷(6.023×10^23) × 18g = 5.379 × 10^-22 g = 5.379 × 10^-25 kg

Approved