10.0 dm3 of air containing H2S as an impurity was passed through a solution of...
CHEMISTRY
JAMB 1990
10.0 dm3 of air containing H2S as an impurity was passed through a solution of Pb(NO3)2 until all the H2S had reacted. The precipitate of PbS was found to weigh 5.02 g. According to the equation: Pb(NO3)2 + H2S → PbS + 2HNO3 the percentage by volume of hydrogen sulphide in the air is? (Pb = 207, S = 32, GMV at s.t.p = 22.4dm3)
- A. 50.2
- B. 47.0
- C. 4.70
- D. 0.47
Correct Answer: C. 4.70
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