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A sample of water, H2O, has a mass of 56.00 g. Calculate the number of water molecules in the sample.
number of molecules:
molecules

Answer :

JoshEast

Answer:  1.872 × 10²⁴ molecules

Explanation:

Moles of Water

Moles = mass ÷ molar mass

          = 56.00 g ÷ 18.015 g/mol

          = 3.1085 mol

Molecules of Water

Number of molecules = moles × Avogadro's Number

                                    =  3.1085 mol × (6.022 × 10²³ molecules/mol)

                                    =  1.872 × 10²⁴ molecules

A 56.00 g sample of water contains 1.872 × 10²⁴ molecules.

Note: We could do all this calculation in one step but I separated it to make it clearer.

                             

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