General Chemistry I — 2019 Past Questions

University of Ilorin CHM101: 3 questions.

Topics: Chemical equations and stoichiometry, Structure of solids

1. A sample of the gaseous compound formed during bacterial fermentation of grain is found to consist of 27.29% carbon and 72.71% oxygen. What is the empirical formula of the compound? (C = 12.0, O = 16.0)
   1. C₂O₄
   2. CO
   3. CO₂
   4. None of the above
2. The surface of a well-formed crystalline solid reveals flat planes intersecting at characteristic angles. This is prominent in:
   1. crystalline solids
   2. amorphous solids
   3. interfacial angles
   4. solids
3. Determine the number of moles of ammonia in 4.26g of ammonia (N = 14.0, H = 1.0).
   1. 0.20 mol
   2. 0.25 mol
   3. 1.20 mol
   4. 1.25 mol

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