As a rough estimate, 1,160,000,000,000,000,000,000,000 atoms of hydrogen, but I wouldn’t want to count them! The concentration of water is 55.55 moles per litre, there are 0.96 moles of water in 17.34 cm3 and therefore 1.926 moles of hydrogen. To get the number of hydrogen atoms, you have to multiply this by Avogadro’s number.
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