explain how you determined the number of moles of cn in each compound

Although the mass number is unitless, it is assigned units called atomic mass units (amu). Q:Zolpidem is a common hypnotic with the chemical formula C19H1N3O. How can I calculate the molality when 75.0 grams of MgCl2 is dissolved in 500.0 g of solvent? K = Express the mercury concentration of the wastewater in ppm and ppb units. Br To obtain 1 mol of carbon-12 atoms, we would weigh out 12 g of isotopically pure carbon-12. )hfRF|AG kkk$gcU)&*]u42am6s\UC_v4YI.k.kpz=P}N@h7C*T5a]))=i-gnm3Y U5N]jrCu]dTBV{)k!6 BJ"|vE0^V&Iufr%cCl:3x2AehH{PgF/&(9_){W]w6#3Nb$I@ D(5Gt$;zr pOV\0"dMH(qciKA))O;jpnDah\Lp"\eHVA!* 2^S1IU+Pb)y@g*FO)Y1J. Would that be a + or a -? H:SO. 2. For example if you have 17.0 mol of NaCl, then. The molecular mass The sum of the average masses of the atoms in one molecule of a substance, each multiplied by its subscript. The molecular formula is an important piece of information for any chemical compound. { "Chapter_1.1:_Chemistry_in_the_Modern_World" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_1.3:_A_Description_of_Matter" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_1.4:_A_Brief_History_of_Chemistry" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_1.5:_The_Atom" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_1.6:_Isotopes_and_Atomic_Masses" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_1.7:__The_Mole_and_Molar_Mass" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_1.8:_Essential_Skills_I" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { "Chapter_1:_Introduction" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_2:_Atomic_Structure" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "Chapter_3:__The_Periodic_Table" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, [ "article:topic", "hypothesis:yes", "showtoc:yes", "license:ccbyncsa", "authorname:anonymous", "licenseversion:40" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FCourses%2FHoward_University%2FGeneral_Chemistry%253A_An_Atoms_First_Approach%2FUnit_1%253A__Atomic_Structure%2FChapter_1%253A_Introduction%2FChapter_1.7%253A__The_Mole_and_Molar_Mass, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\). How many grams are equal to Reaction Type: 8.00 NO The problem for Dalton and other early chemists was to discover the quantitative relationship between the number of atoms in a chemical substance and its mass. B) K3N You did this calculation and put down the value previously. The numerical value of Avogadro's number, usually written as No, is a consequence of the arbitrary value of one kilogram, a block of Pt-Ir metal called the International Prototype Kilogram, and the choice of reference for the atomic mass unit scale, one atom of carbon-12. Solution for How many grams are equal to 2.5 moles of zinc? _(PHN8dm*p% O Sheets of printer paper are packaged in reams of 500, a seemingly large number. Answer to Solved 1. If you want any, Q:W SIS. In this question mass of solution and mass% of NaCl is given to us and we have to find out, Q:covalent bonds which do not share their electrons equally are called The concept of the mole allows us to count a specific number of individual atoms and molecules by weighing measurable quantities of elements and compounds. l type='a'> Write the balanced equation for the reaction that is (occurring. In the laboratory, for example, the masses of compounds and elements used by chemists typically range from milligrams to grams, while in industry, chemicals are bought and sold in kilograms and tons. What is, A:In Mass spectrophotometry, organic sample is bombarded with high energy electron source , thus one, Q:A solution is formed by adding 2.70 grams of solid sodium hypochlorite, NaClO, to 200.0 ml of, A:It is given that the solution is formed by adding 2.70 grams of solid sodium hypochlorite, NaClO, to, Q:Compounds such as Freon 112 (referred to as chlorofluorocarbons, or CFCs) were used as refrigerants. How do I find its empirical formula? After solving the problem, explain whyq, w,andUhave the signs that you calculated. Determine the molecular formula of the dye. We begin by calculating the molecular mass of S2Cl2 and the formula mass of Ca(ClO)2. Unlock expert answers by supporting wikiHow, http://www.chemistry.wustl.edu/~coursedev/Online%20tutorials/chemforms.htm, http://science.widener.edu/~svanbram/ptable_6.pdf, http://antoine.frostburg.edu/chem/senese/101/gases/faq/molecular-formula-cyclopropane.shtml, Example: n = PV/RT = (0.984 atm * 1 L) / (0.08206 L atm mol-1 K-1 * 318.15 K) = 0.0377 mol, Example: 14.42 g / 0.0377 mol = 382.49 g/mol. A:It is an basic Organic Reaction mechanism. NH3 endobj 6. D) BaCl2. Q:In beer's law, what will happen to the molar apsorptivity when the bath length increases to 2 cm., A:Answer: A lack of this vita min in the diet can lead to anemia. A compound contains 3.2g of Cu, 0.6g of C and 2.4 O2. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. View this solution and millions of others when you join today! Q:Write Waldens Cycle of Reactions Interconverting. And asking the structure of product The mass of the copper om the compound eas found to be 0.1271g.1) Calculate the mas of oxygen in the sample. According to the most recent experimental measurements, this mass of carbon-12 contains 6.022142 1023 atoms, but for most purposes 6.022 1023 provides an adequate number of significant figures. Experts are tested by Chegg as specialists in their subject area. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. endobj Why or why not? Stop procrastinating with our smart planner features. What is the finaltemperature of0.122 mole ofmonatomic ideal gas that performs 75J of work adiabatically if the initial temperature is 235C? CO2 Nam lacini

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sectetur adipiscing elit. 2.5 moles of zinc? David W. Oxtoby, H. Pat Gillis, Laurie J. Butler, Emil Slowinski, Wayne C. Wolsey, Robert Rossi, Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer, Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste. A:This question belong to Chemical Bonding and molecular structure. NaCl, A:Answer: Determine the number of moles of the compound and determine the number of moles of each type of atom in, (d) 78.452 g of aluminum sulfate, Al2(SO4)3, Number of moles of K = 0.0179 mol x 1 = 0.0179 mol, Number of moles of Br = 0.0179 mol x 1 = 0.0179 mol, Number of moles of H = 0.0015 mol x 3 = 0.0045 mol of H, Number of moles of P = 0.0015 mol x 1 = 0.0015 mol of P, Number of moles of O = 0.0015 mol x 4 = 0.006 mol of O, Number of moles of Ca = 255 mol x 1 = 255 mol of Ca, Number of moles of C = 255 mol x 1 = 255 mol C, Number of moles of O = 255 mol x 3 = 765 mol of O, Number of moles of Al = 2 x 0.229 mol = 0.458 mol of Al, Number of moles of S = 3 x 0.229 mol = 0.687 mol of S, Number of moles of O = 12 x 0.229 mol = 2.748 mol of O, Number of moles of C = 0.0061 x 10 -4 mol x 8 = 0.0488 x 10 -4 mol of C, Number of -moles of H = 0.0061 x 10 -4 mol x 10 = 0.061 x 10 -4 mol of H, Number of moles of N = 0.0061 x 10 -4 mol x 4 = 0.0244 x 10 -4 mol of N, Number of moles of O = 0.0061 x 10 -4 mol x 2 = 0.0122 X 10 -4 mol of O, Number of moles of K = 0.0179 mol x 1 = 0.0179 mol, Number of moles of Br = 0.0179 mol x 1 = 0.0179 mol, Number of moles of H = 0.0015 mol x 3 = 0.0045 mol of H, Number of moles of P = 0.0015 mol x 1 = 0.0015 mol of P, Number of moles of O = 0.0015 mol x 4 = 0.006 mol of O, Molecular weight of CaCO3 = 40 + 12 + 3 x 16 = 90 g/mol, Number of moles of Ca = 255 mol x 1 = 255 mol of Ca, Number of moles of C = 255 mol x 1 = 255 mol C, Number of moles of O = 255 mol x 3 = 765 mol of O, Number of moles of Al = 2 x 0.229 mol = 0.458 mol of Al, Number of moles of S = 3 x 0.229 mol = 0.687 mol of S, Number of moles of O = 12 x 0.229 mol = 2.748 mol of O, Mass = 0.1250 mg of C8H10N4O2 = 1.2 x 10 -4 g, Number of moles of C = 0.0061 x 10 -4 mol x 8 = 0.0488 x 10-4 mol of C, Number of moles of H = 0.0061 x 10 -4 mol x 10 = 0.061 x 10-4 mol of H, Number of moles of N = 0.0061 x 10 -4 mol x 4 = 0.0244 x 10-4 mol of N, Number of moles of O = 0.0061 x 10 -4 mol x 2 = 0.0122 X 10-4 mol of O. Nam

sectetur adipiscing elit. Suppose that you were given y n but did not know the value of the echo time, N, or the amplitude of the echo, a. } Is this the correct formula of the compound? How many grams are equal to 2.5 moles of zinc? excess water. A) Na2O <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S>> Molarity, Q:classification of alcohols according to the type of the carbon-carbon chain, A:The answer provides a classification scheme for alcohols based on the type of carbon-carbon chain, Q:3:21 AM Wed Mar 1 For example, it might show the compound's connectivity or its molecular shape, such as by drawing dashed lines to indicate their bonds. Whenever you go to the mole, divide by Avogadro's number. Q:So which amongst these central atoms would be polyatomics? In each case, the number of grams in 1 mol is the same as the number of atomic mass units that describe the atomic mass, the molecular mass, or the formula mass, respectively. Q:Calculate the number of mol of solute in It allows determination of the number of molecules or atoms by weighing them. Cv = 3R/2, mole1deg1 Q:How does an SN1 reaction mechanism form answers A and C? You will need to know the empirical formula to calculate the molecular formula, and you will need to know that the difference between these two formulas is a whole number multiplier. 4 0 obj Given: number of moles and molecular or empirical formula. This will yield the molecular formula. A sample consisting of 3.5 moles of a perfect gas at 350 K and 1.25 atm undergoes reversible adiabatic expansion to 4.5 atm. Tcvn;}Hhg]'r%1RM7QY4O-m j:oF5( Q} 2`k2i2 )* /VvZhS@ClY@++BUo'PU>Au 2`Cs!It?NsS*["unTn29mZ)~QOxa=_:r k )q*h( 724gbO+Z-@& +CY]BK8B3Zfn 30U #OhPW;XH';YZe{vX!#U$[O One mole of carbon still has 6.022 1023 carbon atoms, but 98.89% of those atoms are carbon-12, 1.11% are carbon-13, and a trace (about 1 atom in 1012) are carbon-14. 3 0 obj Example: The empirical formula would be C12OH30. The mole is the basis of quantitative chemistry. The range goes from 0 - 14, with 7 being neutral. When we consider the behavior of gases in Unit 5, we can use the data to calculate the molecular weight of each gas. This is analogous to the fact that a dozen extra large eggs weighs more than a dozen small eggs, or that the total weight of 50 adult humans is greater than the total weight of 50 children. in the. Q:How can the following synthesis be accomplished? PCIs(9) PC13(9) +, Q:The higher the Now that you have these equilibrium concentrations (values) plug them into the equilibrium constant expression to calculate the value of Kc. Explain how you determined the molar mass of sugar. *|.kX^IxqkO|[ };*?WKaF2~-] ??_> Among its many uses, ethanol is a fuel for internal combustion engines. Unit 4 Toxins Lesson 78 Worksheet Living By Chemistry 2e Teacher's Resource Materials 2015 W.H. OH Clearly, the mole is so large that it is useful only for measuring very small objects, such as atoms. OH 29 0 obj <> endobj 64 0 obj <>/Filter/FlateDecode/ID[<220BA46AA5FD43449D2E5C106A154CFD>]/Index[29 73]/Info 28 0 R/Length 152/Prev 146085/Root 30 0 R/Size 102/Type/XRef/W[1 3 1]>>stream Thanks to all authors for creating a page that has been read 166,536 times. [ C=N]] Calculate the ratio of moles of \( \mathrm{H}_{2} \mathrm{O} \) to moles of anhydrous \( \left.\mathrm{KAl}_{2} \mathrm{SO}_{4}\right)_{2} \), Show all work including units, Note: Report. The important point is that 1 mol of carbonor of anything else, whether atoms, compact discs, or housesalways has the same number of objects: 6.022 1023. Lewis dot structure. Is this the molecular formula or the simplest formula? reduce, A:Thermal Conductivity d) wavenumber concentration Draw the detailed step-by-step mechanism. The mass of 1.75 mol of S2Cl2 is calculated as follows: \( moles\; S{_{2}}Cl_{2} \left [molar\; mass \dfrac{g}{mol} \right ]= mass\; S{_{2}}Cl_{2} \), \( 1.75\; mol\; S{_{2}}Cl_{2}\left ( \dfrac{135.036\; g\; S{_{2}}Cl_{2}}{1\;mol\;S{_{2}}Cl_{2}} \right )=236\;g\; S{_{2}}Cl_{2} \). = Possible Earned 2 Practice: Turn off Show units and Show numerical result. For a physical or chemical process, the change in enthalpy, H, is measured using, Q:Alcohols can act as either acids or bases, similar to water. Calculate the mass of 0.0122 mol of each compound. B. C. Cite evidence to justify your response. C Adding together the masses gives the molecular mass: 24.022 amu + 6.0474 amu + 15.9994 amu = 46.069 amu, Alternatively, we could have used unit conversions to reach the result in one step, as described in Essential Skills 2, \( \left [ 2\; atoms\: \; \left ( \dfrac{12.011\; amu}{1\, \; atom\; C} \right ) \right ] +\) \( \left [ 6\; atoms\: H\; \left ( \dfrac{1.0079\; amu}{1\, \; atom\; H} \right ) \right ]+\) \( \left [ 1\; atoms\: O\; \left ( \dfrac{15.9994\; amu}{1\, \; atom\; O} \right ) \right ] \). Calculate the molecular mass of ethanol, whose condensed structural formula is CH3CH2OH. MC Stacked vertically, a mole of pennies would be 4.5 1017 mi high, or almost six times the diameter of the Milky Way galaxy. ATTEMPT TO SOLVE YOUR PROBLEM: A flask is filled with Fe 3+ and SCN -, which decomposes according to the following reaction. Testosterone: male. K =, Q:Can you help me with initial temperature (Ti) of water? include the proper phases, A:The basic equilibrium for a weak base A- is written as follows: This mole conversion calculator also helps you calculate molar mass of a substance using a similar mathematical approach but in less time. 0.900% (mass/mass) molarity of sucrose solution = 0.500 (M)mol/L 1 mole liquid water = 18.02 grams Explain why or why not. The procedure for calculating molecular masses is illustrated in Example 1. The calculated answer (0.5639 mol) is indeed less than 1 mol, so we have probably not made a major error in the calculations. View this solution and millions of others when you join today! To appreciate the magnitude of Avogadros number, consider a mole of pennies. A(aq) + HO(l) = HA(aq) + OH(aq), Q:REFER TO THIS WORKED EXAMPLE AS YOU Sign up for free to discover our expert answers. Q:Which one of the following is 4-bromo-3-methylcyclohexanone? Pellentes. Conversely, it enables chemists to calculate the mass of a substance needed to obtain a desired number of atoms, molecules, or formula units. A chemist prepared a compound that she thought had the formula FeI3. 0.1 M KNO, Q:How many grams of solute are needed to prepare What charge does CN have in KCN and in Mg (CN),? The molecular formula tells you which atoms are present in the compound, and how many of each are present. Online employment recruitment is especially popular. How do you calculate molality from molarity? 1. B The formula mass of Ca(ClO)2 is obtained as follows: The molar mass of Ca(ClO)2 is 142.983 g/mol, \( moles\; Ca\left ( ClO \right )_{2}\left [ \dfrac{molar\; mass\; Ca\left ( ClO \right )_{2}}{1\; mol\; Ca\left ( ClO \right )_{2}} \right ]=mass\; Ca\left ( ClO \right )_{2} \), \( 1.75\; mol\; Ca\left ( ClO \right )_{2}\left [ \dfrac{142.983\; g Ca\left ( ClO \right )_{2}}{1\; mol\; Ca\left ( ClO \right )_{2}} \right ]=250.\; g\; Ca\left ( ClO \right )_{2} \). Ametalactivityseries, Q:Which of the following formulas is not correct? If you had 350 L of CO at STP, then you would have, #"350 L" "1 mol"/"22.4 L"# = 15.6 mol of CO. Lastly, it has been calculated that one mole of any substance contains #6.02 10^23# atoms (if you are talking about pure elements), molecules (if you are talking about covalent compounds), or the general term, particles (used primarily for inorganic compounds). Enthalpy of combustion of a compound is always equal to the difference between enthalpy of, Q:The infra-red attached below is of the ferrocene molecule after it has been through the process of, A:To Analyze The infra-red attached of the ferrocene molecule after it has been through the process, Q:The increments on the thermometer are one-degree Celsius, therefore need to record the temperature. name For example, the mass of 1 mol of magnesium (atomic mass = 24.305 amu) is 24.305 g. Because the atomic mass of magnesium (24.305 amu) is slightly more than twice that of a carbon-12 atom (12 amu), the mass of 1 mol of magnesium atoms (24.305 g) is slightly more than twice that of 1 mol of carbon-12 (12 g). At the very beginning of the reaction how much SCN- will be present in the flask initially? Justify your choice, and for choices you did not pick, explain what is wrong with them. c.. K16_Chemistry_20_Mole_and_Mole_Conversions_Booklet_rev_fall_2011.doc, CH_U7_A1_Mole_Conversions_worksheet_stoichiometry.pdf, The Network Diagram for the Delta College is given as below Activity 1 Task 1, 353 Supportive and Competitive Roles of Government The government of a country, b X 4 Y is N 0 17 so P X 4 Y 2 P X 4 Y 17 2 17 Q 2 17 c X Y is N 0 2 so P X Y 2, Newspaper usa the finger lakes a popular sport in the shade or Afghanistan and, This question deals with advertising effectiveness The question indirectly asks, aspiration and selection unfolds in a series of stages from childhood into, draws a conclusion about whether the independent variables have impacts on, However statutory audit refers to only auditing of the entitys financial, Questions and Answers PDF 206276 occur A syslog message is issued The monitored, CEI Graphic Organizer Rev S2020 (1) (1).docx, For example SACCOs coordinate and reconfigure resources by using modern, c Ask students to review your wireframes i Answer test ii Explanation When you. al See Periodic Table See Hint 2) Calculate the number of moles of oxygen in the sample. Sketch two plot of pressure (p) vs. volume (V): one for irreversible expansion and one for reversible expansion. It, A:Well, we will first determine the number of moles of Cl- present in the mixture. A:Check the formulas for each compound and then check whether it is written correctly or not. 1.00 mol of an ideal gas, initially occupying 12.2 L at 298 K, expands isothermally against a constant external pressure of 1.00 bar until the pressure of the gas is equal to the external pressure. Calculate p, q, w, U, and H for the . of 0.360 M has a pH of, Q:The equilibrium constant, K, for the following reaction is 1.20x10 at 500 K: A:The missing reagents of the above all transformations are listed below. stream Find w for the reversible isothermal expansion of 3.000 mol of argon (assumed ideal) from a volume of 100.0L to a volume of 500.0L at 298.15K, 5.00 mol of a perfect gas expand isothermally at 298 K from 2.00 dm3 to 12.00 dm3 It's okay to look up the atomic weight if you don't know it. For example, if you have 600 g of NaCl, then. 1 Why is molality used for colligative properties? 9. We use cookies to make wikiHow great. How can you convert between mass and moles? The molecular mass and the formula mass of a compound are obtained by adding together the atomic masses of the atoms present in the molecular formula or empirical formula, respectively; the units of both are atomic mass units (amu). If a solution of HF is, Q:Macmillan Learning To go from moles to grams, multiply by the formula mass. Molar Mass: 65.38 grams/mole l type='a'> What is the molar mass of cyanocobalamin to two decimal places? Pellentesque dapibus efficitur laoreet. g of A:Here , the answer will be option (d), i.e. A Determine the number of atoms of each element in the molecule. OH, A:The carbohydrate molecules in which two monosaccharide units are bonded to each other by an ether, Q:When a 23.4 mL sample of a 0.357 M aqueous hydrocyanic acid solution is titrated with a 0.303 M, A:Well, we will require the Ka value of HCN for the calculation. The number in a mole is called Avogadros number: 6.022142 x 1023, after the 19th-century Italian scientist who first proposed how to measure the number of molecules in a gas. Get access to millions of step-by-step textbook and homework solutions, Send experts your homework questions or start a chat with a tutor, Check for plagiarism and create citations in seconds, Get instant explanations to difficult math equations. we need to explain the product formation, Q:Feedback 90 degrees Keep in mind that the lowest number of atoms in a molecule for some elements might not be 1. 27 status page at https://status.libretexts.org. I need help ASAP please. 1 questions that has 4 parts ! a. The average mass of a monatomic ion is the same as the average mass of an atom of the element because the mass of electrons is so small that it is insignificant in most calculations. This article has been viewed 166,536 times. HO* Find answers to questions asked by students like you. Deriving the Molecular Formula from an Empirical Formula, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/b\/b7\/Find-Molecular-Formula-Step-1-Version-2.jpg\/v4-460px-Find-Molecular-Formula-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/b\/b7\/Find-Molecular-Formula-Step-1-Version-2.jpg\/aid3408618-v4-728px-Find-Molecular-Formula-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"