Formulas Different Chemistry formulas needed 2.5 / 5 based on 2 ratings ? ChemistryCalculationsASAll boards Created by: JadeCreated on: 29-11-10 20:45 Percentage Atom Economy Bromo-methane is reacted with sodium hydroxide to make methanol. CH2Br + NaOH ----> CH3OH + NaBr Calculate the atom economy. 1 of 4 % atom economy = mass of desired product x 100 total mass of reactants (12+(3x1)+16+1) x 100 (12+(3x1)+80)+(23+16+1) 32g x100 135g = 23.7% 2 of 4 Ar from Mass Spectrum From a mass spectrum graph we see that 79% of magnesium atoms have a mass charge of 24, 10% have a mass charge of 25 and 11% have a mass charge of 26. What is the Ar of magnesium, using this mass spec? 3 of 4 79 x 24 = 1896 10 x 25 = 250 11 x 26 = 286 1896 + 250 + 286 = 2432 2432 100 = 24.32 = 24.3 4 of 4
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