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Complete the following table:
| $2H_2O$ |  |
$2H_2$ | + | $O_2$ | |
| nb. of moles initially | 5.8 | 0 | 0 | ||
| variation of mole nb. | ........(1) | ........(2) | ........(3) | ||
| nb. of moles finally | 2 | ........(4) | ........(5) |
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