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"i At, 122 Chapter Three Stoichiometry 76. Determine the molecular formulas to which the following em- pirical formulas and molar masses pertain. a. SNH (188.35 g/mol) b. NPCI 2 (347.64 g/mol) c. COC 4 0 4 (341.94 g/mol) d. SN (184.32 g/mol) 77. A compound that contains only carbon, hydrogen, and oxygen is 48.64% C and 8.16% H by mass. What is the empirical for- mula of this substance? 78. The most common form of nylon (nylon-6) is 63.68% carbon, 12.38% nitrogen, 9.80% hydrogen, and 14.14% oxygen. Calcu- late the empirical formula for nylon-6. 79. There are two binary compounds of mercury and oxygen. Heating either of them results in the decomposition of the compound, with oxygen gas escaping into the atmosphere while leaving a residue of pure mercury. Heating 0.6498 gof one of the compounds leaves aresidue of 0.6018 g. Heating 0.4172 gof the other compound re- sults in a mass loss of 0.016 g. Determine the empirical formula of each compound. 80. A sample of urea contains 1.121 g N, 0.161 g H, 0.480 g C, and 0.640 g O. What is the empirical formula of urea? 81. A compound containing only sulfur and nitrogen is 69.6% S by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?
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