Question

How many water molecules are in 12.3 mL of water? The density of water = 0.98 g/mL, and the molar mass of water = 18.01 g/mol.
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Answer 1

Answer:

4.03 × $10^{23}$

Explanation:

Mass = Volume ×Density

Mass of H2O = 12.3 × 0.98 = 12.054 g

No. of moles of H2O = Mass/Molar mass = 12.054/18.01 = 0.67 moles

Now, no. of molecules in 1 mole of a substance = 6.022 × $10^{23}$

Therefore, no. of molecules of water = 0.67 × 6.022 ×  $10^{23}$ = 4.03 × $10^{23}$

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