Bellwork NutraSweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O.  Calculate the empirical formula of NutraSweet.

CHAPTER 7 THE MOLE Part 4

Molecular formulas are the actual formulas Molecular formulas are the actual formulas. They may be the same as the empirical formula or a multiple of it.

To find the multiple (n), take the gram formulas mass (gfm) and divide by the empirical formula mass (efm): n = gfm efm Multiply each subscript in the empirical formula by n to get the molecular formula.

A white powder is analyzed and found to have the empirical formula P2O5. The compound has a molar mass of 283.9 g. What is the compound’s molecular formula? P2O5 = 142.0 g/mol

A white powder is analyzed and found to have the empirical formula P2O5. The compound has a molar mass of 283.9 g. What is the compound’s molecular formula? P2O5 = 142.0 g/mol gfm/efm 283.9 g/mol 142.0 g/mol = 2 2(P2O5) = P4O10

Molar Mass of compound: 98.96 g. A compound used as an additive for gasoline to help prevent engine knock shows the following percentage composition: 71.65% Cl 24.27% C 4.07% H Determine the empirical formula and the molecular formula for this compound. Molar Mass of compound: 98.96 g.

A compound used as an additive for gasoline to help prevent engine knock shows the following percentage composition: 71.65% Cl 24.27% C 4.07% H The molar mass is known to be 98.96 g. Determine the empirical formula and the molecular formula for this compound. /2.02 = 1 71.65 g Cl 1 mol Cl = 2.02 mol Cl 35.5 g Cl 24.27g C 1 mol C = 2.02 mol C 12.0 g C 4.07g H 1 mol H = 4.03 mol H 1.01 g H 1:1:2 ClCH2 or CH2Cl efm = 12.0+2.0+35.5=49.5 g/mol 98.96/49.5=2 C2H4Cl2 /2.02 = 1 /2.02 = 2