please check. the first 2 page were all wrong except for weight and number of valence electron of sample 4.

Molecular weight: (5) UNKNOWN 2 (40 points) Contains Heavy Isotope Report molecular weight for compound with heavy isotope; In PubChem, look up the data for the parent compound that does not contain the heavy isotope. Molecular formula: (5) Lewis Structure: (5) No. of valence electrons: (5) Molecular weight: (5) Identification: (5 points each) Compound Name (PubChem): PubChem CID: Melting Point (K): Boiling Point (K) : (Note: these temperatures should be reported in K; be careful to convert, if necessary.) 1. Are the samples you have analyzed safe to breathe? Both the gases are hazardous for human health hence not safe to breathe. 2. Using mass spectra, is it possible to distinguish between CO and N2, both of which have a molecular weight of 28 ? Explain. Yes, we can distinguish between CO and N2 as fragmentation of CO will give peak corresponding to carbon at m/z=12 and for N2, a peak at m/z=14 will be observed corresponding to nitrogen atom. 3. Suppose you are analyzing a mass spectrum with major peaks at 17,29 , and 46 , and some other smaller peaks. The molecule is known to be stable at room temperature, and it obeys the Octet Rule. Could the molecule be NO2 ? (Hint: consider the Lewis structure.) The fragmentation of CO2 will give peaks at 29 and 17m/z. 4. You examine two mass spectra, and see that both of them have the same molecular weight, but their fragmentation patterns are different. Does it follow that these spectra represent two structural isomers? Explain. Isomers of same molecule will have smallest m/z is different which means that both the spectra correspond to 2 different molecules. 5. In this lab, we have assumed that all the samples are isotopically pure, that is, all molecules in the samples that we have examined each contain just one isotope of each constituent element. In nature, however, the elements exist in several isotopes of varying abundance. When one examines a mass spectrum of a real molecular sample, it sometimes displays peaks with higher mass than the molecular weight of the molecule. Why is this? Explain. Molecular weight: (5) UNKNOWN 2 (40 points) Contains Heavy Isotope Report molecular weight for compound with heavy isotope; In PubChem, look up the data for the parent compound that does not contain the heavy isotope. Molecular formula: (5) Lewis Structure: (5) No. of valence electrons: (5) Molecular weight: (5) Identification: (5 points each) Compound Name (PubChem): PubChem CID: Melting Point (K): Boiling Point (K) : (Note: these temperatures should be reported in K; be careful to convert, if necessary.) 1. Are the samples you have analyzed safe to breathe? Both the gases are hazardous for human health hence not safe to breathe. 2. Using mass spectra, is it possible to distinguish between CO and N2, both of which have a molecular weight of 28 ? Explain. Yes, we can distinguish between CO and N2 as fragmentation of CO will give peak corresponding to carbon at m/z=12 and for N2, a peak at m/z=14 will be observed corresponding to nitrogen atom. 3. Suppose you are analyzing a mass spectrum with major peaks at 17,29 , and 46 , and some other smaller peaks. The molecule is known to be stable at room temperature, and it obeys the Octet Rule. Could the molecule be NO2 ? (Hint: consider the Lewis structure.) The fragmentation of CO2 will give peaks at 29 and 17m/z. 4. You examine two mass spectra, and see that both of them have the same molecular weight, but their fragmentation patterns are different. Does it follow that these spectra represent two structural isomers? Explain. Isomers of same molecule will have smallest m/z is different which means that both the spectra correspond to 2 different molecules. 5. In this lab, we have assumed that all the samples are isotopically pure, that is, all molecules in the samples that we have examined each contain just one isotope of each constituent element. In nature, however, the elements exist in several isotopes of varying abundance. When one examines a mass spectrum of a real molecular sample, it sometimes displays peaks with higher mass than the molecular weight of the molecule. Why is this? Explain