Posted by R on Tuesday, September 16, 2008 at 7:57pm.
(a) Convert the grams of CO2 to moles of CO2 by dividing grams of CO2 by the molar mass of CO2.
Moles of CO2 = moles of carbon, C. Multiply moles of C by 12.011g/mol to get grams of carbon in the sample.
(b) Find the moles of H2O in a similar way.
Moles of H = (2)(moles of H2O). To get grams of H, multiply moles of H times 1.00794 g/mol
(c) Grams of O in the sample = (grams of sample) - (grams H + grams H)
(d) Convert grams O to moles
(e) Divide moles C, moles H, and moles O by the smallest of the three. This will give you a ratio of three numbers. Multiply those numbers if needed to get three whole numbers. The three whole numbers are the three subscripts in the empirical formula.
Clarification: In the last step multiply the three numbers in the mole ratio by the same number. Select the smallest multiplier that will give a three whole number ratio. Tose three numbers are your subscripts.
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