Answer:
1 mole
Step-by-step explanation:
The balanced equation for is given below:
2Na + 2H2O —>2NaOH + H2
Next, we shall determine the number of mole of NaOH in 40g of NaOH.
This is illustrated below:
Mass of NaOH = 40g
Molar Mass of NaOH = 23 + 16 + 1 = 40g/mol
Number of mole =Mass /Molar Mass
Number of mole NaOH = 40/40 = 1 mole
Finally, we shall determine the number of mole of Na required to produce 1 mole of NaOH ( i.e 40g).
This is illustrated below:
From the balanced equation above,
2 moles of Na reacted to produce 2 moles of NaOH.
Therefore, it will take 1 mole of Na to also produce 1 mole of NaOH.