# What volume of carbon dioxide will be released when sodium bicarbonate weighing 4.2 g is heated?

January 27, 2021 | education

| Given:

m (NaHCO3) = 4.2 g

To find:

V (CO2) -?

Decision:

1) Write the reaction equation:

2NaHCO3 = (tOC) => Na2CO3 + CO2 ↑ + H2O;

2) Calculate the molar mass of NaHCO3:

M (NaHCO3) = Mr (NaHCO3) = Ar (Na) + Ar (H) + Ar (C) + Ar (O) * 3 = 23 + 1 + 12 + 16 * 3 = 84 g / mol;

3) Calculate the amount of NaHCO3 substance:

n (NaHCO3) = m (NaHCO3) / M (NaHCO3) = 4.2 / 84 = 0.05 mol;

4) Determine the amount of substance CO2:

n (CO2) = n (NaHCO3) / 2 = 0.05 / 2 = 0.025 mol;

5) Calculate the volume of CO2:

V (CO2) = n (CO2) * Vm = 0.025 * 22.4 = 0.56 l.

Answer: The CO2 volume is 0.56 liters.

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