Organic/General chemistry

[yihshyan0420]

1.Calculate the theoretical analysis values for:
a. 1,1-diiodo-2,2-dimethylpropane

2. Analysis of 3-ethyl-3-buten-2-ol gave C, 72.13%; H, 11.92%. Calculate the percent deviation of these
results from the theoretical values for C and H.

3. When 6-chloro-2-methyl-3-cyclohexenol was submitted for elemental analysis, the results were C,
51.07%; H, 7.96%; Cl, 21.53%. Are these values within the required ±0.4% of theoretical? If not
calculate the apparent empirical/molecular formula and suggest the identity of the contaminant.

4. Elemental analysis of a compound gave the results C, 65.44%; H, 5.49%; N, 8.58%. Calculate the
empirical formula. Determination of the molecular weight by "wet" methods indicated that the
molecular weight is between 150 and 180 g/mole. Determine the molecular formula, the molecular
weight, and the index of hydrogen deficiency. Suggest a possible structure for the compound.

5. Elemental analysis of a compound gave the results C, 73.60%; H, 8.03%; N, 8.58%. The molecular
weight of the compound is 326. Calculate the molecular formula and the index of hydrogen
deficiency.

6. Elemental analysis of a compound gave the results C, 69.72%; H, 11.7%, and the mass spectrum
gave the highest amu ion at m/z 71. Calculate the empirical formula, the molecular formula, and the
true molecular weight.


For the first 3 problems I do not know which equations to use. I know how to calculate to find the empirical formula and the molecular formula but i am confused about what steps to take to find the molecular weight of the compounds for 4-6.

[yihshyan0420]

I just need help with the last problem.