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120cm\(^3\) of hydrogen were sparked with 60cm\(^3\) of oxygen at 110\(^o\)C. What was the volume...

Chemistry
WAEC 1989

120cm\(^3\) of hydrogen were sparked with 60cm\(^3\) of oxygen at 110\(^o\)C. What was the volume of steam produced? The equation for the reaction is 

  2H\(_2\)(\(_g\)  +   O\(_2\)(\(_g\) →  2H\(_2\)O\(_g\)

  • A. 30cm3
  • B. 60cm3
  • C. 90cm3
  • D. 120cm3
  • E. 180cm3
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Correct Answer: Option D
Explanation

According to Gay-Lussac's Law of Combining Volumes, it states that when gases react, their volumes combine in a simple whole-number ratio, provided the temperature and pressure are constant.  

Consequently,       2H\(_2\)(\(_g\)  +   O\(_2\)(\(_g\) →  2H\(_2\)O\(_g\)

                                2         :    1                  :   2

                              120cm\(^3\): 60cm\(^3\) : 120cm\(^3\)

Hence, 120cm\(^3\) of steam was produced.


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