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What volume of gas is evolved at S.t.p if 2g of calcium trioxocarbonate (IV) is...

Chemistry
JAMB 2004

What volume of gas is evolved at S.t.p if 2g of calcium trioxocarbonate (IV) is added to a solution of hydrochloric acid?
[Ca = 40, C = 12, O = 16, Cl = 35.5, H = 1 Molar volume of agas at s.t.p = 22.4 dm3

  • A. 112 cm2
  • B. 224 cm2
  • C. 448 cm2
  • D. 2240 cm2
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Correct Answer: Option C
Explanation

CaCO3(s) + 2HCl(aq) → CaCl2 + H2O(l) + CO2


The relative molecular mass of CaCO3 = 40 + 12 + 16 * 3 = 52 +48 = 100 ;

Relative molecular mass of CO2 = 12 + 10 * 2 = 44


From the above equation, 100g of CaCO3reacts with 44g of CO2 at s.t.p. i.e 22.4 dm3


2g of CaCO3 will react with (2*22.4)/100 of CO2 = 0.448 dm3


0.448 dm3 = 0.448 * 1000 = 448cm3

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709