Stoichiometry: Calculations with Chemical Formulas and Equations

48) (a) m = 2.87 g C_xH_yO_z         m = 6.32 mg CO₂         m = 2.58 mg H₂

            m = 6.32 mg CO₂ * 1 mol CO₂/44.01 g CO₂ * 1 g/10³ mg * 1 mol C/1 mol CO₂ * 12.01 g C/1 mol C = 1.72 x 10^-3 g C

            n = 1.44 x 10^-4 mol C

            m = 2.58 mg H₂O * 1 mol H₂O/18.02 g H₂O * 1 g/10³ mg * 2 mol H/1 mol H₂O * 1.01 g H/1 mol H = 2.89 x 10^-4 g H

            n = 2.86 x 10^-4 mol H

            m = 2.78 mg x 1 g/10³ mg - 1.72 x 10^-3 g C - 2.89 x 10^-4 g H = 7.71 x 10^-4 g O

            n = 7.71 x 10^-4 g O * 1 mol O/16.00 g O = 4.82 x 10^-5 mol O

            C_0.000144H_0.000286O_0.0000482 ===> C_2.99H_5.93O ===> C₃H₆O