[D] 1.87 kg
Avogadro's number: 6.022 ×10^23 particles per mole of a substance.
You have 6.25 x 10^25 molecules, so divide that by avogadro's number to get 103.786 moles of water (H2O) in which each mole of H2O weighs 18 grams, so multiply 103.786 × 18 = 1868.15 grams which is equivalent to 1.87 kg
