Chemistry
10g of magnesium carbonate reacts completely with excess dilute hydrochloric acid. What volume of carbon dioxide is formed at room temperature and pressure? [Mg=24, C=12, O=16] The equation for the reaction is:
MgCO3 + 2HCl ⟶ MgCl2 + H2O + CO2
- 2.8 dm3
- 2.6 dm3
- 2.2 dm3
- 2.4 dm3
Mole Concept
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Answer
2.6 dm3
Reason —
1 mole of MgCO3 gives 1 mole of CO2
Molar Mass of MgCO3
MgCO3 = 1 x 24 + 1 X 12 + 3 X 16 = 84 g/mol
∴ No. of moles of MgCO3 in 10g
Moles of MgCO3 = = 0.119 mol
From the reaction, 1 mole of MgCO2 gives 1 mole of CO2,
∴ Moles of CO2 = 0.119mol
Volume of CO2 at RTP,
= 0.119 X 22.4 = 2.6 dm3
∴ volume of carbon dioxide at RTP is 2.6 dm3
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