How many molecules are present in 175.2 g of water? (The molar mass of water is 18.02 g/mol)

Hey there!

First let's convert grams to moles.

There are 18.02 grams in every mole, so divide 175.2 by 18.02.

175.2 ÷ 18.02 = 9.723

We have 9.723 moles of water.

There are 6.022 x 10²³ molecules in each mole, so multiply that by 9.723.

9.723 x 6.022 x 10²³

58.55 x 10²³

5.855 x 10²⁴

There are 5.855 x 10²⁴ molecules of water in 175.2 grams of water.

Hope this helps!

pure substance: iron,copper

impure substance: water,charcoal