Each mole of substance contains 6.02 x 1023 component parts, in this case water molecules.
If you have 2.3 moles of water you will have 2.3 x 6.02 x 1023 which is 1.3846 x 1024 molecules.
Each molecule contains 2 hydrogen atoms, so the total number of hydrogen atoms in 2.3 moles of water will be 2 x 1.3846 x 1024 = 2.7692 x 1024.
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