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Mass of crucible = 10g Mass of crucible and soil before heating = 29g Mass...

Biology
JAMB 2009

Mass of crucible = 10g
Mass of crucible and soil before heating = 29g
Mass of a crucible and soil after heating = 18g
From the information above, determine the percentage of water in the given soil sample?

  • A. 20%
  • B. 25%
  • C. 40%
  • D. 60%
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Correct Answer: Option D
Explanation

From the information given:

Mass of crucible = 10g
Mass of crucible + soil before heating = 29g

Mass of soil before heating = 29 - 10 = 19g
Mass of a crucible + soil after heating = 18g

Mass of soil after heating = 18 - 10 = 8g

Mass of water loss = 19 - 8 = 11g

% of water loss = \(\frac{mass of water loss}{Total mass of soil}\times 100\)

                         = \(\frac{11}{19}\times 100\)

                         = 57.89%

From the options provided, the closest answer is 60%

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 - 127076
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