11. Conservation of Mass, Charge, and       Energy   Previous PageNext Page
      PROBLEMS
1. Balance the following chemical reactions properly. What principle of conservation is involved?

(a) NaOH + CO2 Na2CO3 + H2O
(b) NH3 + Fe2(SO4)3 (NH4)2 SO4 + Fe(OH)3
(c) Mg(OH)2 + HCL MgCL2 + H2O
(d) Mg(OH)2 + H2SO4 MgSO4 + H2O
(e) NaHCO3 Na2CO3 + H2CO3
(f) Ca3(PO4)2 + H2SO4 CaSO4 + H3PO4

2. Crystals of potassium chlorate, KCLO3, will first melt if heated, and then decompose to give oxygen gas and potassium chloride.1

(a) Write a balanced equation for the decomposition.
(b) How many moles of potassium chlorate are needed to produce three moles of oxygen gas?
(c) How many moles of potassium chlorate are needed to give 100 moles of oxygen gas?
(d) How many moles and how many grams of oxygen gas would be produced by decomposing 100 g of potassium chlorate?
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