Ch14

What type of compounds/molecules can be detected using LC-MS and what mass range or molecular mass ranges can be detected using LC-MS?

At what masses do the molecular ions occur? What are the percentages of each molecular ion?

Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make sure to consider the isotope pattern if necessary) 1001 50 Br A 121 B 122 B NH 123 123 Mass M/e 124 124 Me C 125 125 OH НО. 126 D CI 127

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If the mass spectrum of a sample has a 7.7% M+1 peak compared to a 100% M+ peak, how many carbon atoms are we then likely to have in our chemical formula?

The highest mass peaks in the mass spectrum of Br2 occur at m/Z 158, 160, and 162. The ratio of intensities of these peaks is approximately 1:2:1. Bromine has two stable isotopes,79Br (50.7% abundance) and 81Br (49.3% abundance). question: What molecular species gives rise to each of these peaks? (Include the mass numbers of the isotopes in your answers.)

Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make sure to consider the isotope pattern) 100 120 Br A 121 x B NH ន 122 Mass M/e 123 123 Me 124 124 OH но ма 125 D 126

Can you please help me with these ochem questions?

In mass spectrometry, there are patterns in the molecular ion region due to isotopic abundances Identify the pattern that would correspond to a molecule containing two chlorines. || A)I M M Me B) II IV C) II Mat D) IV E) V Met

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how is mass spectrometry important in biology?

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In the mass spectrum of an unknown organic compound, the molecular ion had a relative abundance of 19.0 while the M+1 had a relative abundance of 1.5. Estimate the number of carbons in the molecule. 1 4 7 2 LO 5 8 carbons 3 6 9 X C

Draw the molecular mass fragments for the following m/z rations. Show all the atoms (including) all the hydrogens clearly. CI m/z 105 m/z 139 m/z 141

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Questions 2: What is the principle that allows us to use a mass spectrometer to determine the intensity of a peak?* Higher molecular mass compounds are less volatile than lower molecular mass compounds. Cations of higher mass are deflected less by a magnetic field than cations of lower mass. Cations reaching the detector causes a current that is proportional to the size of these ion. O Larger çations takes longer to reach the detector. O All of these statements are correct.

True or false Magnetic coils reduce magnetic field when current flows through them.   Most NMR machines can detect excitement from different types of atom.   NMR is a spectroscopic technique to observe local magnetic fields around atomic proton.   A 12C NMR can only see activity from carbon atoms.   NMR signal is produced by the inactivation of the nuclei sample with radio waves into nuclear magnetic resonance, which is detected with sensitive radio receivers.

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What is not true about mass spectrometry?   Question 13 options:   Only the molecular ion and cationic fragments are deflected, and they are then separated by their mass-to-charge ratio (m/z)   It is used to determine the molecular weight and molecular formula of a compound.   In a mass spectrometer, a compound is converted into ions, which are then separated by a magnetic field.   In a mass spectrometer, a compound is first vaporized and then bombarded with electromagnetic radiation which generates a radical cation that is symbolized by (M)+•   A molecular ion is often very unstable and susceptible to fragmentation

▾ Part A -NHCH2CH3 + HBr Draw the molecule on the canvas by choosing buttons from the Tools (for bonds and charges), Atoms, and Templates toolbars. L H± 120 EXP. L CONT. H 0 N S

On 3 Feb 2023, a train derailed in East Palestine, Ohio (4700 residents). Approximately 1.1 million pounds of vinyl chloride CH2=CHCI, a toxic flammable gas, was released. Use Excel to calculate the abundance of the M+2 species of vinyl chloride. Note that there are multiple ways to add 2 extra neutrons to the molecule. Paste your spreadsheet into your answers. Use cntl+ (control+tilde key next to the number 1 key) to view all formulas and paste into answers too. Element Mass No. Mass (Da) Abundance (%) H 1 1.0078 99.988 2 2.0141 0.012 C 12 12.000 98.93 13 13.003 1.07 Cl 35 34.969 75.78 37 36.966 24.22

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Write the molecular formula for a compound with the possible elements C, H, N and O that exhibits a molecular ion at M = 73.0899. Exact Masses of the Most Abundant Isotope of Selected Elements Isotope Natural abundance (%) Exact mass 99.985 1.008 12c 98.90 12.000 14N 99.63 14.003 160 99.76 15.995

12) Na + H2O → NaOH + H2 13) Ag20 → Ag + O2 14) Se + O2 → SO3 15) CO2 + H2O → C6H1206 + O2 16) K+ MgBr2 → KBr + Mg 17) HCI + CaCO3 > CaCl2 + H20 + CO2 18) HNO3 + NaHCO3 → NANO3 + H2O + CO2 19) H2O + O2 > H2O2 20) NaBr + CaF2 → NaF + CaBr2 21) H2SO4 + NANO2 → HNO2 + NazSO4 Word Equations Write the word equations below as chemical equations and balance: 1) Zinc and lead (II) nitrate react to form zinc nitrate and lead. 2) Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas. 3) Sodium phosphate and calcium chloride react to form calcium phosphate and sodium chloride. 4) Potassium metal and chlorine gas combine to form potassium chloride. 5) Aluminum and hydrochloric acid react to form aluminum chloride and hydrogen gas. 6) Calcium hydroxide and phosphoric acid react to form calcium phosphate and water. 7) Copper and sulfuric acid react to form copper (II) sulfate and water and sulfur dioxide.

Model 5: Isotope Natural Abundances Atom Most common isotope C O S N CI Br 12C (100) 160 (100) 32S (100) 14N (100) 35 CI (100) Jump in Mass Next most common isotope (no. extra neutrons) (no. found for every 100 atoms of most common isotope) +1 13C (1.11) 180 (0.20) 34S (4.40) 15N (0.38) 37 Cl (32.5) "¹Br (98.0) 79Br (100) For example: There are 1.11 *C atoms on the planet for every 100 ¹2C atoms. Equivalent ways of saying this are: There are likely to be 111 1³C atoms in a sample of 10,111 carbon atoms or 1.10% of the carbon on the planet is 1³C (since 111/10,111 x 100% = 1.10%). Critical Thinking Questions 15. What does the superscript to the left of each atom label tell you (e.g., the 12 in ¹2C)?