Question

What is the difference between H2 and H2O

Answer 1

H2 is hydrogen molecule
H2O is water molecule
when H2 reacts with O2 it forms H2O
The reaction is as follows:-
2H2+O2 --> 2H2O

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Answer 2

H2 means Hydrogen.it is an element having two hydrogen atoms.
H2O means water.It is the molecule of two hydrogen atoms and one oxygen atom