STC 112 Theory Questions: Stoichiometry and Molar Mass Calculations

100 Level Science Technology Department exam questions and detailed answers. Download the answers in document format. Correct, detailed, and straightforward answers.

Questions:

a(i) Define the term stoichiometry in chemical reactions.
ii State the relationship between the mass of one atom and the mass of one mole of those atoms.

b. Calculate the molar mass of the following compound
i. CuSO₄·5H₂O
ii. (NH₄)₂PO₄
iii. Al₂(SO₄)₃

c(i). Calculate the mass percent of N in ammonium nitrate.
ii. How many grams of N are in 35.8 kg of ammonium nitrate?

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