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Teachers Notes:

Problem 1:
3mg O₂ x (.001 g /mg) x (1mole O₂/32.0 g O₂) x 1/1 Liter = 9.38 x 10^-5M

Problem 2:
ammonia, NH₃, 14.0 g N/ 17.0 g NH₃ x 100 = 82.4% N
ammonium biphosphate, (NH₄)₂PO₄, 28.0 g N/131 g (NH₄)₂PO₄ x 100 =21.4 % N
ammonium nitrate, NH₄NO₃, 28.0 g N/ 80.0 g NH₄NO₃ x 100 = 35.0% N
ammonium sulfate, (NH₄)₂SO₄, 28.0 g N/ 132 g (NH₄)₂SO₄ x 100 = 21.2% N
urea, N₂H₄CO, 28.0 g N/ 60.0 g N₂H₄CO x 100 = 46.7 % N

Problem 3:
1.4 x 10⁹ kilograms of calcium carbonate

a. 1.4 x 10⁹ kg CaCO₃ x (1 x 103g/kg) x (1 mol CaCO₃/100.1 g CaCO₃) = 1.4 x 1010 mol CaCO₃
b. 1.4 x 109 kg CaCO₃ x (1 x 103g/kg) x ( 1 mol CaCO₃ / 100.1 g CaCO₃) x (1 mol CO₂/ 1 mol CaCO₃) x (44.0 g CO₂/1 mol CO₂) = 6.15 x 1011 g CO₂