11:00Empirical Formula & Molecular Formula Determination From Percent CompositionThe Organic Chemistry Tutor647views
16:49Introduction to Combustion Analysis, Empirical Formula & Molecular Formula ProblemsThe Organic Chemistry Tutor796views
Multiple ChoiceElemental analysis of a pure compound indicated that the compound had 72.2% C, 8.50% H and the remainder as O. If 0.250 moles of the compound weighs 41.55 g, what is the molecular formula of the compound?798views11rank1comments
Multiple ChoiceUse the given empirical formula and molar mass to determine the molecular formula.Empirical Formula: NH2 Molar Mass: 32.052 g/mol245views4rank
Multiple ChoiceGlyceraldehyde (M = 90.078 g/mol), a simple monosaccharide, is comprised of 39.999% C, 6.714% H, and 53.297% oxygen by atomic weight. What would be its molecular formula?202views5rank
Textbook QuestionGlycine, an amino acid used by organisms to make proteins, is represented by the following molecular model. (a) Write its molecular formula.606views
Textbook QuestionThe following diagram represents an ionic compound in which the red spheres represent cations and the blue spheres represent anions. Which of the following formulas is consistent with the drawing? KBr, K2SO4, Ca1NO322, Fe21SO423.623views1rank
Textbook QuestionWhich molecular scale image best represents the ionic com-pound that forms between cesium and chlorine? (Cesium is represented by red circles, and chlorine is represented by blue circles.) (LO 6.12) (a) (b) (c) (d) 262views
Textbook QuestionLactic acid forms in muscle tissue after strenuous exercise. Elemental analysis shows that lactic acid is 40.0% carbon, 6.71% hydrogen, and 53.3% oxygen by mass. If the molec-ular weight of lactic acid is 90.08, what is the molecular for-mula? (LO 3.11) (a) CH2O (b) C3H6O3 (c) C4H8O4 (d) C4H10O21166views
Textbook QuestionWrite a chemical formula for each molecular model. (See Appendix IIA for color codes.) (c) 343views
Textbook QuestionWrite a chemical formula for each molecular model. (See Appendix IIA for color codes.) (a)769views
Textbook QuestionEach of the pictures (a)–(d) represents one of the following substances at 25 °C: sodium, chlorine, iodine, sodium chloride. Which picture corresponds to which substance? (a) 481views
Textbook QuestionFluoxetine, marketed as an antidepressant under the name Prozac, can be represented by the following ball-and-stick molecular model. Write the molecular formula for fluoxetine, and calculate its molecular weight. (Red = O, gray = C, blue = N, yellow green = F, ivory = H.)651views1rank
Textbook QuestionThe following ball-and-stick molecular model is a representation of acetaminophen, the active ingredient in such over-thecounter headache remedies as Tylenol. 1Red = O, gray = C, blue = N, ivory = H.2 (a) What is the formula of acetaminophen?543views
Textbook QuestionThe following ball-and-stick molecular model is a representation of thalidomide, a drug that causes birth defects when taken by expectant mothers but is valuable for its use against leprosy. The lines indicate only the connections between atoms, not whether the bonds are single, double, or triple. 1Red = O, gray = C, blue = N, ivory = H.2 (a) What is the formula of thalidomide?324views
Textbook QuestionIf yellow spheres represent sulfur atoms and red spheres represent oxygen atoms, which of the following drawings shows a collection of sulfur dioxide (SO2) units? (a) (b) (c) (d) 442views
Textbook QuestionGive molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (c) Acetic acid (vinegar)347views
Textbook QuestionGive molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (b) Ethylene glycol (automobile antifreeze)562views
Textbook QuestionGive molecular formulas corresponding to each of the following ball-and-stick molecular representations (red = O, gray = C, blue = N, ivory = H). In writing the formula, list the elements in alphabetical order. (a) Alanine (an amino acid)330views
Textbook QuestionIn the following drawings, red spheres represent cations, and blue spheres represent anions. Match the drawings (a)–(d) with the following ionic compounds: (i) Ca3(PO4) (ii) Li2CO32 (iii) FeCl2 (a) (iv) MgSO4 (a) (b) (c) (d) 783views
Textbook QuestionBall-and-stick representations of benzene, a colorless liquid often used in organic chemistry reactions, and acetylene, a gas used as a fuel for high-temperature welding, are shown below. (a) Determine the molecular formula of each.418views
Textbook QuestionWhat is the molecular formula of each of the following compounds? (b) empirical formula NH2Cl, molar mass = 51.5 g/mol857views
Textbook QuestionWhat is the molecular formula of each of the following compounds? (b) empirical formula C2H4O, molar mass = 88.0 g/mol711views
Textbook QuestionWhat is the molecular formula of each of the following compounds? (a) empirical formula HCO2, molar mass = 90.0 g/mol1090views1comments
Textbook QuestionDetermine the empirical and molecular formulas of each of the following substances: (a) Styrene, a compound used to make Styrofoam® cups and insulation, contains 92.3% C and 7.7% H by mass and has a molar mass of 104 g/mol.1238views
Textbook QuestionDetermine the empirical and molecular formulas of each of the following substances: (c) Monosodium glutamate (MSG), a flavor enhancer in certain foods, contains 35.51% C, 4.77% H, 37.85% O, 8.29% N, and 13.60% Na, and has a molar mass of 169 g/mol.1498views
Textbook QuestionDetermine the empirical and molecular formulas of each of the following substances: (b) Caffeine, a stimulant found in coffee, contains 49.5% C, 5.15% H, 28.9% N, and 16.5% O by mass and has a molar mass of 195 g/mol.1275views
Textbook QuestionWrite the molecular and structural formulas for the compounds represented by the following molecular models:875views
Textbook QuestionDetermine the empirical and molecular formulas of each of the following substances: (c) Epinephrine (adrenaline), a hormone secreted into the bloodstream in times of danger or stress, contains 59.0% C, 7.1% H, 26.2% O, and 7.7% N by mass; its molar mass is about 180 u.1216views
Textbook QuestionDetermine the empirical and molecular formulas of each of the following substances: (b) Cadaverine, a foul-smelling substance produced by the action of bacteria on meat, contains 58.55% C, 13.81% H, and 27.40% N by mass; its molar mass is 102.2 g/mol.1304views
Textbook QuestionDetermine the empirical and molecular formulas of each of the following substances: (a) Ibuprofen, a headache remedy, contains 75.69% C, 8.80% H, and 15.51% O by mass and has a molar mass of 206 g/mol.1431views
Textbook QuestionWrite the molecular and structural formulas for the compounds represented by the following models:728views
Textbook QuestionWrite a ratio showing the relationship between the molar amounts of each element for each compound. (See Appendix IIA for color codes.) (b) 478views
Textbook QuestionAn unknown liquid is composed of 5.57% H, 28.01% Cl, and 66.42% C. The molecular weight found by mass spectrometry is 126.58. What is the molecular formula of the compound?798views
Textbook QuestionAn unknown liquid is composed of 34.31% C, 5.28% H, and 60.41% I. The molecular weight found by mass spectrometry is 210.06. What is the molecular formula of the compound?578views
Textbook QuestionCinnamaldehyde is a compound that is responsible for the characteristic aroma of cinnamon. It contains 81.79% C, 6.10% H, and the remaining is oxygen. Its molar mass is 132 g/mol. Determine its molecular formula.1590views
Textbook QuestionFrom the given empirical formula and molar mass, find the molecular formula of each compound. a. C6H7N, 186.24 g/mol1309views
Textbook QuestionFrom the given molar mass and empirical formula of several compounds, find the molecular formula of each compound. c. C3H2N, 312.29 g/mol1253views
Textbook QuestionFrom the given molar mass and empirical formula of several compounds, find the molecular formula of each compound. b. CCl, 284.77 g/mol1908views2rank1comments
Textbook QuestionDisilane, Si2Hx, is analyzed and found to contain 90.28% silicon by mass. What is the value of x?973views
Textbook QuestionA certain metal sulfide, MS2, is used extensively as a high-temperature lubricant. If MS2 is 40.06% sulfur by mass, what is the identity of the metal M?889views1rank
Textbook QuestionThe stimulant amphetamine contains only carbon, hydrogen, and nitrogen. Combustion analysis of a 42.92 mg sample of amphetamine gives 37.187 mg of H2O and 125.75 mg of CO2. If the molar mass of amphetamine is less than 160 g/mol, what is its molecular formula?648views
Textbook QuestionThe molecular weight of an organic compound was found by mass spectrometry to be 70.042 11. Is the sample C5H10, C4H6O, or C3H6N2? Exact masses of elements are: 1.007 825 (1H); 12.000 00 (12C); 14.003 074 (14N); 15.994 915 (16O).1038views
Textbook QuestionFrom the molecular structures shown here, identify the one that corresponds to each of the following species: (a) chlorine gas; (b) propane; (c) nitrate ion; (d) sulfur trioxide; (e) methyl chloride, CH3Cl.371views
Textbook Questionb) Given the mass spectrum of benzene, identify the molec-ular weight and give the molecular formula. 459views
Textbook Question(b) An elemental analysis of the acid indicates that it is composed of 5.89% H, 70.6% C, and 23.5% O by mass. What is its molecular formula?1426views
Textbook QuestionA pulverized rock sample believed to be pure calcium carbonate, CaCO3, is subjected to chemical analysis and found to contain 51.3% Ca, 7.7% C, and 41.0% O by mass. Why can't this rock sample be pure CaCO3?814views
Textbook QuestionEthylene glycol, commonly used as automobile antifreeze, contains only carbon, hydrogen, and oxygen. Combustion analysis of a 23.46 mg sample yields 20.42 mg of H2O and 33.27 mg of CO2. What is the empirical formula of ethylene glycol? What is its molecular formula if it has a molecular weight of 62.0?1250views1rank
Textbook QuestionFructose is a common sugar found in fruit. Elemental analysis of fructose gives the following mass percent composition: C 40.00%, H 6.72%, O 53.28%. The molar mass of fructose is 180.16 g>mol. Find the molecular formula of fructose.1984views
Textbook QuestionCombustion analysis of a 13.42-g sample of equilin (which contains only carbon, hydrogen, and oxygen) produces 39.61 g CO2 and 9.01 g H2O. The molar mass of equilin is 268.34 g>mol. Find its molecular formula.3100views
Textbook QuestionA compound of molar mass 177 g>mol contains only carbon, hydrogen, bromine, and oxygen. Analysis reveals that the compound contains eight times as much carbon as hydrogen by mass. Find the molecular formula.1746views
Textbook QuestionThe structural formula of isopropyl alcohol, better known as 'rubbing alcohol,' is shown. What is the chemical for-mula of isopropyl alcohol?941views
Textbook QuestionLactic acid, a compound found both in sour milk and in tired muscles, has the structure shown. What is its chemical formula?957views
Open QuestionDichloroethane, a compound that is often used for dry cleaning, contains carbon, hydrogen, and chlorine. it has a molar mass of 99 g/mol. analysis of a sample shows that it contains 24.3% carbon and 4.1% hydrogen. what is its molecular formula?164views
Open QuestionOf the following molecular formulas for hydrocarbons which is an empirical formula149views
Open QuestionElemental analysis of the unknown gas from part a revealed that it is 30.45% N and 69.55% O by mass. What is the molecular formula for this gas?150views
Open QuestionA compound is 43.7% phosphorus and 56.3% oxygen. The formula mass of the compound is 284 g. calculate the empirical formula and molecular formula of the compound.292views
Open QuestionA compound has a molar mass of 180.18 g/mol. Given the following percent composition, calculate the molecular formula: 39.99% C, 6.73% H, 53.28% O.209views
Open QuestionA compound responsible for the odor of garlic has a molecular weight of 146 g/mol. A 0.650 g sample of the compound contains 0.321 g of carbon, 0.044 g of hydrogen, and 0.285 g of sulfur. What is the molecular formula of the compound?160views
Open QuestionA compound containing only sulfur and nitrogen is 69.6% s by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?227views
Open QuestionDetermine the empirical and molecular formula for chrysotile asbestos. Chrysotile has the following percent composition: 28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O. The molar mass for chrysotile is 520.8 g/mol.296views
Open QuestionDetermine the empirical formula for the compound represented by each molecular formula.295views
Open QuestionElemental analysis of the unknown gas from part A revealed that it is 30.45% N and 69.55% O by mass. What is the molecular formula for this gas?210views