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The molar mass of CH2 is 14.0267 g/mol. (42 g/mol) / (14.0267 g/mol) = 3 to the nearest whole number So multiply the empirical formula by 3: C3H6

2=

each one determine the number of moles of each atom in a given sample. moles = mass / molar mass 10. moles Pb = 38.43 g / 207.2 g/mol = 0.1855 mol moles C = 17.83 g / 12.01 g/mol = 1.485 mol moles H = 3.74 g / 1.008 g/mol = 3.710 moles Now ratio Pb : C : H = 0.1855 : 1.485 : 3.710 divide each number in the ratio by the smallest number Pb : C : H (0.1855/ 0.1855) : (1.485 / 0.1855) : (3.710 / 0.1855) 1 : 8 : 20 empirical formula PbC8H20

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