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Molar Mass -round to two decimal places Of a compound Li2CrO4 Lithium Chromate: Contains 2 moles Li, 1 mol Cr, and 4 mol O. 128.87g Li- 6.941x2=13.882g Cr- 51.996g O-15.999x4=63.996g Percent Composition: step 1: calculate formula mass Mg: 1 x 24.3 = 24.3 Cl: 2 x 35.4 = 70.8 ---- formula mass = 95.1 step 2: divide each component mass by the formula mass and multiply by 100 Mg: 24.3/95.1 x 100 = 25.6% Cl: 70.8/95.1 x 100 = 74.4% step 3: make certain the percentages add up to 100 (+/- 0.1) 25.6 + 74.4 = 100
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Unformatted text preview: http://209.85.215.104/search?q=cache:C057q6KafWsJ:www.sciencebyjones.com/PDF %2520files/Formula%2520Math %25201%2520PDF.pdf+percent+composition+notes&amp;hl=en&amp;ct=clnk&amp;cd=1&amp;gl=us Empirical Formula: Simplest (whole number) Molar ratio (Sample exercise 3.11) 1. Assume 100g of sample 2. Change the amount of grams to moles 3. Divide by smallest number of moles Molecular Formula Balancing Equations Stoichiometric calculations Calculations Involving Limiting Reagent...
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