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The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO\(_3\) is treated with 0.2dm\(^3\)...

Chemistry
JAMB 2020

The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO\(_3\) is treated with 0.2dm\(^3\) of 1 Mole of HCL in the equation

CaCO\(_3\) + 2HCL ⇒  CaCl\(_2\)  + H\(_2\) O + CO\(_2\)  , is?

  • A. 1.00 X 10\(^{23}\)
  • B. 6.02 X 10\(^{23}\)
  • C. 6.02 X 10\(^{22}\)
  • D. 6.02 X 10\(^{24}\)
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Correct Answer: Option C
Explanation

1 mole of CaCO\(_3\) = 100g or  6.02 X 10\(^{23}\)

liberated 1 mole of CO\(_2\) or 44g or 6.02 X 10\(^{23}\)

 

:100g =  6.02 X 10\(^{23}\)

10g of CaCO\(_3\) = x

cross multiply

[10g X 6.02 X 10\(^{23}\)] / 100g = x

⇒ x = 6.02 X 10\(^{22}\)

 

Since 

 6.02 X 10\(^{23}\) of CaCO\(_3\) liberated 6.02 X 10\(^{23}\) of CO\(_2\)

 

⇒ 6.02 X 10\(^{22}\) of CaCO\(_3\) will liberate 6.02 X 10\(^{22}\) of CO\(_2\)

There is an explanation video available below.


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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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 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
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