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3 cards from this section. Quick, good the night before a test.
What are the two methods to estimate nitrogen in organic compounds?
Think about the names of the chemical processes discussed.
Why is nitrogen important for plants?
Consider the role of nitrogen in biological systems.
What method involves heating organic nitrogen compounds with copper oxide?
Think about the name of the method associated with heating.
True or false: The Kjeldahl method directly measures nitrogen gas.
Consider how each method interacts with ammonia.
A research chemist uses the Dumas method for nitrogen estimation on a 1g sample that produces 0.5L of nitrogen gas at STP. Calculate the mass percentage of nitrogen in the original sample.
Use the relation that 1 mole of gas occupies 22.4L at STP.
In the Kjeldahl method, a 0.2 g sample yields 15 mL of ammonia when treated with sulfuric acid. How would you calculate the percentage of nitrogen from the given data?
Remember the stoichiometry of ammonia to nitrogen conversion.
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