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Unformatted text preview: 8. Calculate the number of moles in 10 grams of each compound in question 6. 9. Calculate the percent by mass of each element in the following compounds: a) NaI b) Ba(NO 3 ) 2 c) C 4 H 8 d) (NH 4 ) 2 Cr 2 O 7 e) CuSO 4 5H 2 O 9. Malonic acid is used in the manufacture of barbiturates (sleeping pills). The composition of the acid is 34.6% C, 3.9% H, and 61.5% O. What is malonic acid's empirical formula? 10. Adipic acid is used in the manufacture of nylon. The composition of the acid is 49.3% C, 6.9% H, and 43.8% O (by mass), and the molecular weight is 146 amu. What is the molecular formula? 11. The composition of an unknown compound is as follows: 17.5% Na, 39.7% Mn, and 42.8% O. The molar mass of the compound is 261.98 g mol-1 . What is the molecular formula of the compound?...
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- Fall '08