Sodium metal and water react to form sodium hydroxide and hydrogen gas:

2 Na + 2 H2O - -> H2 + 2 NaOH

What mass of Na will react with excess water to produce 15 g NaOH?

Mass of sodium react = 8.63 g

Explanation:

Given dа ta:

Mass of sodium hydroxide produced = 15 g

Mass of sodium react = ?

Solution:

Chemical equation:

2Na + 2H₂O → H₂ + 2NaOH

Number of moles of sodium hydroxide:

Number of moles = mass / molar mass

Number of moles = 15 g / 40 g/mol

Number of moles = 0.375 mol

Now we will compare the moles of Sodium and sodium hydroxide.

NaOH : Na

2 : 2

0.375 : 0.375

Mass of Sodium:

Mass = number of moles * molar mass

Mass = 0.375 mol * 23 g/mol

Mass = 8.63 g