What is the difference between $2H$ and $H_2$?
(N/A) $2H$ represents $2$ individual atoms of hydrogen,which exist independently. In contrast,$H_2$ represents a single molecule of hydrogen,which consists of $2$ hydrogen atoms chemically bonded together.
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Species property $H_2O$ $CO_2$ $Na$ atom $MgCl_2$ No. of moles $2$ - - $0.5$ No. of particles - $3.011 \times 10^{23}$ - - Mass $36 \, g$ - $115 \, g$ -
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| No. of moles | $2$ | - | - | $0.5$ |
| No. of particles | - | $3.011 \times 10^{23}$ | - | - |
| Mass | $36 \, g$ | - | $115 \, g$ | - |
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