2. Urea is a very important nitrogenous fertiliser and has the molecular formula NH CONH. Calculate the percentage of
nitrogen in urea.
[Ans: 46.67%)
5. A hydride of nitrogen contains 87.5% by mass of nitrogen. Determine its empirical formula.
[Ans: NH)
4. 0.24 g sample of a compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of
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