Question

Calculate the number of grams of sodium oxide that will be produced when 115g of sodium react with oxygen.​

Answer 1

Mass = 154.95 g

Step-by-step explanation:

Given data:

Mass of sodium react = 115 g

Mass of sodium oxide formed = ?

Solution:

Chemical equation:

4Na + O₂ → 2Na₂O

Number of moles of sodium:

Number of moles = mass/molar mass

Number of moles = 115 g/ 23 g/mol

Number of moles = 5 mol

Now we will compare the moles of sodium and sodium oxide.

Na : Na₂O

4 : 2

5 : 2/4×5 = 2.5 mol

Mass of sodium oxide:

Mass = number of moles × molar mass

Mass = 2.5 mol × 61.98 g/mol

Mass = 154.95 g