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Unformatted text preview: T= 22 ° C + 273= 295 K (.965 atm)(.329 L) = n (.08206 mmHg L/ mol K) (295 K) n= .0131 mol N 2 .0131 mol N 2 x (1 mol N 2 / 1 mol MNO 2 ) = .0131 mol MNO 2 Mass MNO 2 = 1.2 g Molar Mass= 1.2 g MNO 2 / .0131 mol MNO 2 = 91.60 g/ mol Molar Mass – Mass of Nitrogen – Mass of Oxygen = Mass of M 90.60 g - 14. 01 g – 2( 16.00 g) = 45.59 g Given that the calculated mass of the cation does not correlate exactly to a particular cation, it will be assumed that the cation is K + , whose mass is closest to the calculated mass. Conclusion The identity of the unknown nitrite salt, 3385, is KNO 2 . When compared to the periodic table, the mass of the cation was closest to that of potassium, or K. The fact that the calculated mass of the cation does not directly match the masses on the periodic table is most probably due to human error, such as while massing the nitrite salt....
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