How many moles of water are there in 45 g of water?

To find the number of moles of water in 45 grams, you can use the molar mass of water (H₂O), which is approximately 18 g/mol. By dividing the mass of water (45 g) by its molar mass (18 g/mol), you get:

45 g ÷ 18 g/mol = 2.5 moles of water.

Thus, there are 2.5 moles of water in 45 g.