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CHEMISTRY

JAMB 2008 - Question 4

Chemistry 2008 JAMB Past Questions - Question 4: 16.8g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon (IV) oxide given off at s.t.p

Choose the correct answers from the options given.

16.8g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon (IV) oxide given off at s.t.p

A: 22.40 dm³

B: 11.20 dm³

C: 2.24 dm³

D: . 1.12 dm³

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Correct Answer

Explanation

2NaHCO₃ (s) ---------- Na₂CO₃ (s) + CO₃ (s) + H₂O(gl)2 moles 1 moles168g 22.4dm³ from the equation168g of NaHCO₃ gives off 22.4dm³ of CO₂ therefore 16.8g of NaHCO₃ will give off = 22.4 x 16.8 168 = 2.24 dm³ of CO₂