Final answer:
Approximately 0.238 grams of water can be made from 8.56 x 10^24 hydrogen molecules.
Step-by-step explanation:
To determine the amount of water that can be made from 8.56 x 1024 hydrogen molecules, we need to convert the number of hydrogen molecules to moles and then use the molar mass of water to convert to grams.
1 mole of water contains 2 moles of hydrogen, so we divide the number of hydrogen molecules by Avogadro's number (6.022 x 1023 molecules/mol) and then multiply by the molar mass of water (18.015 g/mol).
Using this calculation, we find that the amount of water that can be made is approximately 0.238 grams.