Balance

nahco3(s) --> na2co3 (s) + h2o (g) + co2 (g)

determine how much baking soda you will need to start with in order to produce 2.50 g of sodium carbonate

Mass = 3.36 g

Explanation:

Given data:

Mass of sodium carbonate produced = 2.50 g

Mass of baking soda required = ?

Solution:

Chemical equation:

2NaHCO₃   →  Na₂CO₃ + H₂O + CO₂

Number of moles of sodium carbonate:

Number of moles = mass/ molar mass

Number of moles = 2.50 g / 106 g/mol

Number of moles = 0.02 mol

Now we will compare the moles of sodium carbonate and baking soda.

              Na₂CO₃         :             NaHCO₃

                  1                 :                   2

                0.02             :               2×0.02 = 0.04 mol

Mass of baking soda:

Mass = number of moles × molar mass

Mass = 0.04 mol× 84 g/mol

Mass = 3.36 g