Determine the formula weights (to 1 decimal place) of each ofthe following compo

Question

Determine the formula weights (to 1 decimal place) of each ofthe following compounds. (a) sodium chloride, NaCl, table salt       _____ amu (b) urea, (NH2)2CO, a compound used as anitrogen fertilizer       _____ amu (c) isopntyl acetate,CH3CO2C5H11,responsible for the odor of bananas       _____ amu (d) benzoic acid, C7H6O2, asubstance used as a food preservative       _____ amu (e) sucrose, C12H22O11, tablesugar       _____ amu Determine the formula weights (to 1 decimal place) of each ofthe following compounds. (a) sodium chloride, NaCl, table salt       _____ amu (b) urea, (NH2)2CO, a compound used as anitrogen fertilizer       _____ amu (c) isopntyl acetate,CH3CO2C5H11,responsible for the odor of bananas       _____ amu (d) benzoic acid, C7H6O2, asubstance used as a food preservative       _____ amu (e) sucrose, C12H22O11, tablesugar       _____ amu

Explanation / Answer

(a)Atomic weight of Na = 23 amu atomic weight of Cl = 35.5 amu So formula weight of NaCl = Atomic weight of Na + Atomicweight of Cl                                         = 23+35.5                                         = 58.5 amu (b)formula weight of urea,(NH2)2CO = 2 ( atomic Wt.of N +2*atomic Wt. of H ) + atomic wt. of C + atomic wt. of O)                                                           = 2 ( 14 + 2 * 1 ) + 12 + 16                                                           = 60.0 amu     (c) isopntyl acetate,CH3CO2C5H11, is= 12 + 3 * 1 + 12 + 2 * 16 + 5 * 12 + 11 * 1 = 130.0 amu (d) benzoic acid,C7H6O2,      is = 7 * 12 + 6 * 1 + 2 * 16 = 122 .0amu (e) sucrose, C12H22O11, is =12 * 12 + 22 * 1 + 11 * 16 = 342.0 amu

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