From the Avogadro's law one mole of a substance contains 6.022× 10^23 particles.
Therefore; 1 mole of water contains 6.022 × 10^23 molecules
Hence 1.7 moles will contain;
1.7 × 6.022 × 10^23 molecules
= 10.2374 × 10^23 molecules
= 1.024 ×10^24 molecules
≈ 1.02 × 10^24 molecules
