Question #cca44

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Answer 1 · 2018-02-08T14:55:00

$"10g"$ of sodium. :)

This is our balanced equation:

$2Na + 2H_2O -> 2NaOH + H_2$

From this, we can tell that for every $1$ mole of water that reacts, exactly $1$ mole of sodium must also react.

$"8g"$ of water is:

$8/("molar mass of water") = 8/18 = "0.44 moles"$

So, this means that $"0.44 moles"$ of sodium must also react. Let's convert that to mass:

$0.44 xx "molar mass of sodium" = 0.44 xx 23 = "10g"$ .