1.  The rusting of iron is due to its reaction with oxygen. An iron nail weighing 8.531 g was left outdoors for a period of one year. After the one year it was found to have a mass of 12.197 g. How many grams of oxygen did the nail react with? 2. What is the temperature of the deep freezer in question 11 above, expressed in Kelvin? (Please note that the constant 273.15 is an exact number).

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