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Chemistry 2009 WAEC Past Questions

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16
The number of particles in one mole of a chemical compound is the
  • A. atomic number
  • B. avogadro's number
  • C. mass number
  • D. oxidation number
View Answer & Discuss WAEC 2009
17

How many molecules are there in 14 g of nitrogen at s.t.p.? [N = 14, Avogadro's constant = 6.02 x 10\(^{23}\) mol-1]

  • A. 6.02 x 1023
  • B. 3.01 x 1023
  • C. 8.43 x 1024
  • D. 1.20 x 1024
View Answer & Discuss (21) WAEC 2009
18
Consider the reaction represented by the equation: 2NaHCO3 → Na2CO 3 + H 2O + CO 2. What is the mass of sodium trioxocarbonate (lV) produced by the complete decomposition of 33.6 g of sodium hydrogen trioxocarbonate (IV)? [NaHCO3 = 84, Na2CO3 = 106]
  • A. 10.6 g
  • B. 16.8 g
  • C. 21.2 g
  • D. 42.4 g
View Answer & Discuss (4) WAEC 2009
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19
What is the percentage by weight of calcium in Ca(OCI)2? [Ca = 40, Cl = 35.5, O = 16]
  • A. 28.0%
  • B. 31.6%
  • C. 43.8%
  • D. 44.5%
View Answer & Discuss (1) WAEC 2009
20
What is the value of -14oC on the Kelvin temperature scale?
  • A. 259K
  • B. 287 K
  • C. 287oK
  • D. 259oK
View Answer & Discuss (6) WAEC 2009
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