The equations given below relate to the manufacture of sodium carbonate (Molecular weight of Na₂CO₃ = 106).
NaCl + NH₃ + CO₂ + H₂O $\overset{}{\to}$ NaHCO₃ + NH₄Cl
2NaHCO₃ $\overset{}{\to}$ Na₂CO₃ + H₂O + CO₂
Questions (a) and (b) are based on the production of 21.2 g of sodium carbonate.
(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate (Molecular weight of NaHCO₃ = 84)?
(b) To produce the mass of sodium hydrogen carbonate, calculate what volume of carbon dioxide, measured at STP would be required?

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What mass of sodium carbonate, Na2CO3 is needed to make 120 mL of a 1.5 M solution? (Given formula weight of sodium carbonate = 106 amu)

The correct option is A 19 gNumber of moles of Na2CO3=120mL1000mL/L×1.5mol/L=0.180mol The formula weight of Na2CO3=106g/mol Mass of Na2CO3=106g/mol×0.180mol=19g

What mass of sodium carbonate, $N a_{2} C O_{3}$ is needed to make 120 mL of a 1.5 M solution? (Given formula weight of sodium carbonate = 106 amu)

The correct option is A 19 g
Number of moles of $N a_{2} C O_{3} = \frac{120 m L}{1000 m L / L} \times 1.5 m o l / L = 0.180 m o l$
The formula weight of $N a_{2} C O_{3} = 106 g / m o l$
Mass of $N a_{2} C O_{3} = 106 g / m o l \times 0.180 m o l = 19 g$