Chemistry 1301A/B Study Guide - Midterm Guide: Medical Imaging, Radiocarbon Dating, Ammonia
9 Apr 2016
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Uses: carbon dating, identifying unknown compounds, medical imaging, smoke detectors. A: mass #, z: atomic # (p+), x: symbol. Average atomic mass: weighted avg of all isotope masses. Avg atomic mass: (% abundance/100 x isotopic mass) = 92. 23/100 (28) + 4. 67/100 (29) + 3. 10/100 (30) 1 mole c = 6. 02 x 1023 atoms c. 1 mole nh3 = 6. 02 x 1023 molecules nh3. Calculate # h atoms in 1 mole of nh3. 1 penny: 1mm thick x (1m/1000mm) x (1km/1000m: = 1 x 10-6 km. 1 mole pennies: 6. 02 x 1023 x 1x10-6 km. Mass percent (mass of one part/total mass of sample) x 100% % mass mole ratio empirical formula. Ppm = part/whole x (1 x 106) Ex. d of seawater at surface is 1. 029 gml-1. Quantitative relationships b/w reactants and products in balanced chemical rxns (ratio shit) (balancing equations) Numbers in a balanced equation: stoichiometry coefficients.
