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Answer:

H2 is molecular hydrogen.it is a molecule of hydrogen that consists of two hydrogen atoms bonded together by one single bond. 2H denotes two moles of elemental hydrogen.it should be noted that elemental hydrogen is not bonded to anything.

Explanation:

H2 (2 being lower to H ) represents a single molecule of hydrogen .It is in the stable state and do not react .

2H represents two atoms of hydrogen .It is in the unstable state and do react immediately ( with oxygen as in water to be stable ) .

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