he molar mass of water is 18.0 grams/mol. How many molecules are in 72.0 grams of water? If you are unsure how to convert grams to particles, please see the example problem linked HERE. a 3.13 x 1025 molecules b 2.41 x 1024 molecules c 1.51 x 1023 molecules d 7.80 x 1026 molecules
To find the number of molecules in 72.0 grams of water, we first need to convert grams to moles using the molar mass of water (18.0 g/mol).
72.0 g / 18.0 g/mol = 4.0 moles
Next, we use Avogadro's number (6.022 x 10^23 molecules/mol) to convert moles to molecules:
4.0 moles x 6.022 x 10^23 molecules/mol = 2.41 x 10^24 molecules
Therefore, the correct answer is b) 2.41 x 10^24 molecules.