How many molecules of h2o are in 1.7 moles of h2o a) 1.02x10^24 b) 30.6 c) 2.7x10-24 d) 38.1

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