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

2. CHAPTER 7 THE MOLE Part 4

3. 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.

4. 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.

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

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

7. 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: % Cl 24.27% C 4.07% H Determine the empirical formula and the molecular formula for this compound.
Molar Mass of compound: g.

8. A compound used as an additive for gasoline to help prevent engine knock shows the following percentage composition: % Cl 24.27% C 4.07% H The molar mass is known to be 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 = =49.5 g/mol
98.96/49.5= C2H4Cl2
/2.02 = 1
/2.02 = 2