Answer: 0.611 grams in 2.04 x 10^24 molecules of H2O
Step-by-step explanation:
To find out how many grams are in 2.04 x 10^24 molecules of H2O, we need to use the molar mass of water.
The molar mass of water is 18.015 g/mol.
To convert the number of molecules to the number of moles, we multiply by Avogadro's number, which is 6.022 x 10^23 molecules/mol.
2.04 x 10^24 molecules x 1mol/6.022 x 10^23 molecules = 0.034 mol
Then we multiply this number of moles by the molar mass of water to find the number of grams:
0.034 mol x 18.015g/mol = 0.611g
Therefore, there are 0.611 grams in 2.04 x 10^24 molecules of H2O.