Caffeine molecular mass

Dividing the gram molecular mass you were given (194.2 g/mol) by this empirical formula mass yields the quotient, 2. Multiplying each of the subscripts in the empirical formula by 2 produces the molecular formula, CgHjgN 02. The common name for this culturally important compound is caffeine. 

The molecular mass of caffeine is 194g-mor. Its empirical mass is 97.10g-mor. ... 

Calculate the molecular masses (in amu) of the following compounds (a) sulfur dioxide (SO2) and (b) caffeine (C8H10N4O2). 

M.9 The stimulant in coffee and tea is caffeine, a substance of molar mass 194 g-mol When 0.376 g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.1 10 g of nitrogen were formed. Determine the empirical and molecular formulas of caffeine, and write the equation for its combustion. 

Application of HPLC-MS to the analysis of a black tea liquor was studied in a paper by Bailey 39 a great deal of useful information could be obtained without sample pretreatment. A tea liquor was applied to a wide-pore HPLC column connected to a mass spectrometer by a VG Plasmaspray interface. Pseudo-molecular ions were obtained from the flavanols, flavanol gallates, chlorogenic acids, 4-coumarylquinic acids, and caffeine, but the flavanol glycosides were extensively fragmented by the interface. Fragments were obtained from unresolved polymer that supported its previous designation as a flavanol polymer. 

Caffeine, a stimulant found in coffee, tea, chocolate, and some medications, contains 49.48% carbon, 5.15% hydrogen, 28.87% nitrogen, and 16.49% oxygen by mass and has a molar mass of 194.2. Determine the molecular formula of caffeine. 

The molar mass of caffeine is 194.2 g. Its empirical formula is C4H5N20. What is its molecular formula ... 

As in the case of FAB-MS, the use of surfactants such as cetyltrimethylammonium bromide (CTAB) can be used to substantially or even completely suppress the matrix-related ion background [81]. Use of the CTAB surfactant also resulted in an improved mass resolution for low-molecular-weight molecules including amino acids, peptides, drugs, and cyclodextrins. This technique has been used successfully for the analysis of caffeine, and the vitamins riboflavin, nicotinamide and pyridoxine in various energy drinks [82]. 

Caffeine, the stimulant in coffee and tea, has the molecular formula C8H10N4O2. Calculate the mass percentage of each element in the substance. Give the answers to three significant figures. 

Practice Problem B Calculate the molecular or formula mass of each of the following compounds (a) calcium cartx>nate (CaCOj), (b) nitrous acid (HNO2), and (c) caffeine (CgH,oN402). 

Caffeine has an empirical formula of C4H5N2O. If it has an experimental molar mass of 194 g, what is the molecular formula of caffeine ... 

An example of the identification of more than one compound in the same spectrum was published by Billets aT. (32). Chlor-promazine, glutethimide and caffeine could be identified in the same mass spectrum which was obtained with DI-MS and El. Cl may facilitate such interpretations (4) because of the simpler MS and greater occurrence of molecular ions observed. 

---