how many molecules ,hydrogen atom,oxygen atom present in 0.5 mole of water
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When there is 0.5 MOLES, the numbers are halved: there is 1 mole of hydrogen and 0.5 moles of oxygen. Avogadro's constant states there are 6.022 x 10^23 atoms/molecules of a substance per one mole, so we can state that there are 6.022 x 10^23 atoms of hydrogen in 0.5 moles of water.
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