ch43-p049 - 49. Since 1.00 L of water has a mass of 1.00...

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49. Since 1.00 L of water has a mass of 1.00 kg, the mass of the heavy water in 1.00 L is 0.0150 × 10 – 2 kg = 1.50 × 10 – 4 kg. Since a heavy water molecule contains one oxygen atom, one hydrogen atom and one deuterium atom, its mass is (16.0 u + 1.00 u + 2.00 u) = 19.0 u = (19.0 u)(1.661 × 10 – 27 kg/u) = 3.16 × 10 – 26 kg. The number of heavy water molecules in a liter of water is (1.50 × 10 – 4 kg)/(3.16 × 10 – 26 kg) = 4.75 × 10 21
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