Final answer:
To find the number of molecules in 1.8 moles of water, you can multiply the number of moles by Avogadro's number, which is 6.022 x 10^23. Therefore, the number of molecules in 1.8 moles of water is approximately 1.0816 x 10^24 molecules.
Step-by-step explanation:
To determine the number of molecules in 1.8 moles of water, you can use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 10^23 particles. Since water (H2O) is comprised of 3 atoms (2 hydrogen and 1 oxygen), each water molecule contains 3 particles. Therefore, to find the number of molecules in 1.8 moles of water, you multiply the number of moles by Avogadro's number:
Number of molecules = 1.8 moles x (6.022 x 10^23 molecules/mole) = 1.0816 x 10^24 molecules of water.