How many molecules of water, H₂O, are present in 75.0 g of H₂O?

Name: How many molecules of water, H₂O, are present in 75.0 g of H₂O?
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Question

Quizplus · Accepted Answer

To find the number of molecules, first calculate the number of moles of water in 75.0 g. The molar mass of water is approximately 18.02 g/mol. Thus, 75.0 g of water is 75.0 g / 18.02 g/mol = 4.16 moles. Using Avogadro's number (6.022 × 10²³ molecules/mol), the number of molecules is 4.16 moles × 6.022 × 10²³ molecules/mol = 2.51 × 10²⁴ molecules.

How Many Molecules of Water, H₂O, Are Present in 75