chromium iii sulfate molar mass

Chromium Potassium Sulfate Dodecahydrate is generally immediately available in most volumes. What is the oxidation number of an atom of nitrogen in the compound N2? 0.360 M b. Finding the atomic masses of elements in the periodic table. What is the formula mass of copper (II) chloride, CuCl2? [Cr+3], InChI=1S/2Cr.3H2O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+3;;;/p-6, CSID:23304, http://www.chemspider.com/Chemical-Structure.23304.html (accessed 01:22, Mar 5, 2023), Validated by Experts, Validated by Users, Non-Validated, Removed by Users, Predicted data is generated using the ACD/Labs Percepta Platform - PhysChem Module. 134.45 amu. H2O are known. Additionally, ill-defined but commercially important "basic chromium sulfates" are known. Convert between Pb (SO4)2 weight and moles Elemental composition of Pb (SO4)2 Sample reactions for Pb (SO4)2 Formula in Hill system is O8PbS2 National Library of Medicine. Die Molmasse ist per Definition die Masse eines Mols einer Verbindung. No predicted properties have been calculated for this compound. The name indicates that the compound has 10 water. Last accessed: 24 Octobert 2020 (amazon.com paid link). Convert grams Cr2 (SO4)3 to moles or moles Cr2 (SO4)3 to grams Molecular weight calculation: 51.9961*2 + (32.065 + 15.9994*4)*3 Percent composition by element Calculate the molecular weight of a chemical compound ( ) .In questo video imparerai come scoprire la massa molare dei composti. [2] (ii) The formula of the chromium(III) ion is Cr3+ and of the sulfate ion is SO 4 2-. milliequivalent per milliliter [meq/ml], microequivalent per milliliter [eq/ml], nanoequivalent per milliliter [neq/ml] and picoequivalent per milliliter [peq/ml]. b. A Computer Science portal for geeks. var tr_already_opted_out = "You already opted out from selling your personal information"; Molar Mass, Molecular Weight and Elemental Composition Calculator Molar mass of Pb (SO4)2 is 399.3252 g/mol Get control of 2022! Enter subscripts as simple numbers. 4. In a polyatomic ion, the algebraic sum of the oxidation numbers of all atoms is equal to. Its melting point is 90 C (194 F), density 3.1 g/cm3. The selected salts were dissolved in deionized water. (To avoid introducing rounding errors on intermediate calculations, enter your answer to four . Mass = moles molar mass. 12 (H 2 O). The reason is that the molar mass of the substance affects the conversion. ( ) . . chromium(III) sulfate. Given, that the molar mass of sulfate decahydrate is 322.19 g/mol. [1] Production and properties [ edit] Chrome alum [1] [2] It contains 14.1% elemental magnesium by mass. Example Reactions: Cr2(SO3)3 + 3 H2SO4 = Cr2(SO4)3 + 3 H2SO3 Cr2(SO3)3 + 3 H2SO4 = Cr2(SO4)3 + 3 SO2 + 3 H2O La masse molaire par dfinition est la masse d'une mole d'un compos. [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Cr+3]. I don't really understand them Which property of manganese dioxide helps it tu It has a molecular formula Cr 2 (SO 4) 3. If a compound contains carbon and hydrogen, assume that carbon dioxide gas and liquid water are produced. Calculate the molar mass of the compound: Moles of copper(I) carbonate = 8.42 mol . 1. How many atoms are present in one formula unit of. It gives the reactions of chromium (III) ions, of potassium ions, and of sulfate ions. Cr2 (SO4)3 can be used for leather tanning. 0.080 M c. 0.720 M d. 0.180 M e. 0.240 M 1 year ago. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. Question: Calculate the molar mass of each of the following compounds. Per trovare la massa molare (peso molecolare) delle sostanze chimiche dobbiamo usare la tavola periodica degli elementi e trovare la massa atomica di ciascun elemento.1 . This site explains how to find molar mass. . Chromium III Sulfate Formula Chromium (III) Sulfate is an inorganic compound in which the ratio of chromium to sulfate is 2:3. A Computer Science portal for geeks. Calculate the molar mass of zinc sulfate. It is insoluable in water. Molar mass of chromium(iii) sulfateis 392.1800 g/mol Compound name is chromium(iii) sulfate Convert between Cr2(SO4)3 weight and moles Compound Moles Weight, g Cr2(SO4)3 Elemental composition of Cr2(SO4)3 Element Symbol Atomic weight Atoms Mass percent Chromium Cr 51.9961 2 26.5164 Sulfur S 32.065 3 24.5283 Oxygen O 15.9994 12 48.9553 . [3] However, this application is obsolete because the simpler chromium(III) sulfate is preferred. E-Book Overview EVERYTHING YOU NEED TO HELP SCORE A PERFECT 5. adding the masses of all the aroms in the molecule, For any molecular, formula unit, or ion, the sum of the average atomic masses of all the atoms represented in a formula is the. What is the mass of 4.80 mol of barium hydride, BaH2? A common request on this site is to convert grams to moles. Chromic Sulfate Formula: Cr2 (SO4)3 Molar Mass: 392.18 Cr2 (SO4)3 is a reddish brown crystal at room temperature. The Chromium III Sulfate is an inorganic compound that has the ratio of chromium to sulfate at 2:3. What is the formula mass of copper(II) chloride, CuCl2. It is a water-soluble blue-grey solid. How many total moles of atoms are there in one mole of silver(I) phosphate, Ag3PO4? Chromium (III) sulfate is a dark green to violet crystalline material. We use the most common isotopes. Upon heating, it turns from blue to green. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. A Computer Science portal for geeks. mass = 2711.24 . . What is the formula for iron three sulfate? The molar mass of carbon dioxide is: . What is the formula for the compound made of aluminum ions, Al3+, and sulfate ions, SO4-2. Browse the list of The side chain of tryptophan will give rise to the largest CD signal in the near UV region when? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. This compound is also known as Chromium(III) Sulfate. High purity, submicron and nanopowder forms may be considered. The molar mass of a substance, also often called molecular mass or molecular weight (although the definitions are not strictly identical, but it is only sensitive in very defined areas), is the weight of a defined amount of molecules of the substance (a mole) and is expressed in g/mol. Jump to main content Jump to site nav. What is the molar mass of tetraethyl lead, Pb(C2H6)4. What is the molar concentration of sulfate ion? Calculate the percent by mass of nitrogen in ammonium sulfate. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Compound Name 2-(2,5'-dimethylbenzoyl)- benzoic acid Formula Molar Mass [g/mol] . Ph Eur 103776 View Pricing & Availability Download Product Safety Card Recommended Products Overview 51.9961*2 + (32.065 + 15.9994*4)*3. . It is a water-soluble blue-grey solid. Read More: Conservation of Biodiversity Sample Questions Ques. For the vectors A\overrightarrow{\mathbf{A}}A and B\overrightarrow{\mathbf{B}}B in the plane of the page as shown in as we discussed earlier, in what direction is (i) AB\overrightarrow{\mathbf{A}} \cdot \overrightarrow{\mathbf{B}}AB, (ii) AB\overrightarrow{\mathbf{A}} \times \overrightarrow{\mathbf{B}}AB, (iii) BA\overrightarrow{\mathbf{B}} \times \overrightarrow{\mathbf{A}}BA ? The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. (The molar mass of K2Cr2O7 is 294.2g). Each time, the volume of the model exhausted chromium tanning baths was 4 L. The temperature was kept constant at 20 C in the tested systems during the process. Formula: Cr2(SO3)3. b) Use this molar mass as a conversion factor to convert 177 g of iron(III) sulfate to moles. What is the correct formula mass for zinc hydroxide, Zn(OH)2? Elements: Chromium (Cr), Oxygen (O), Sulfur (S), CAS Registry Number (CAS RN): 10101-53-8. The formula for chromium (III) sulfate decahydrate is Cr2(SO4)310H2O C r 2 ( S O 4) 3 10 H 2 O. These relative weights computed from the chemical equation are sometimes called equation weights. PbSO4. ) in formulas for adduct molecules, such as water of hydration. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. 84.79g of chromium(III) sulfate dodecahydrate. Find Atomic Mass of Each Element Um die Molmasse (Molekulargewicht) von Chemikalien zu bestimmen, mssen wir das Periodensystem der Elemente verwenden und die Atommasse jedes Elements ermitteln. . What mass (in grams) does this represent? Finding molar mass starts with units of grams per mole (g/mol). To complete this calculation, you have to know what substance you are trying to convert. National Center for Biotechnology Information. The complete combustion . Mass of sulfate decahydrate = 8.42 mol 322.19 gram / mol. What is the oxidation number of As in AsO4-3. Accordingly, 141 mg of elemental magnesium is contained in 1000 mg of magnesium glycinate. 1 . Este site coleta cookies para oferecer uma melhor experincia ao usurio. Compute Mass of Each Element Equip yourself to ace the AP Chemistry Exam with this comprehensive study guideincluding 2 full-length practice tests, thorough content reviews, access to our AP Connect Online Portal, and targeted strategies for every section of the exam. ADVERTISEMENT MORE FROM REFERENCE.COM Answer (a): For calculating moles of KCr (SO4)2.12H2O, we need to first calculate its molar mass. a Determine the moles of chromium (III) potassium sulfate (chrome alum), KCr (SO4)2.12H, O, used in the experiment. (1), where [Cr] 0 was the mass of chromium in the slag sample before sodium roasting and [Cr]s was the mass of water-soluble hexavalent Cr(VI) in the form of sodium chro- gram per deciliter [g/dl], milligram per deciliter [mg/dl], microgram per deciliter [g/dl], nanogram per deciliter [ng/dl] and picogram per deciliter [pg/dl]. Number of moles of chromium sulfate = Mass / molar mass Number of moles of chromium sulfate = 0.25 g/ 392.16 g/ mol Number of moles of chromium sulfate = 6.4 10 moles Number of formula units: 1 mole = 6.022 10 formula units 6.4 10 moles 6.022 10 formula units / 1 mol 38.541 10 formula units Advertisement Previous Next common chemical compounds. Moreover, it is a blue-grey solid that is soluble in water. Also known as: Chromic sulfate ; Dichromium trisulfate. How many mL of a 3.25 M ammonium sulfate solution would . Molecular formula: Cr 2 (SO 4) 3 Elements: Chromium (Cr) , Oxygen (O) , Sulfur (S) Molecular weight: 392.16 g/mol Molar volume: 130.199 cm/mol CAS Registry Number (CAS RN): 10101-53-8 Conversion rate () of sodium roasting process was defined as Eq. WebQC is a web application with a mission to provide best-in-class chemistry tools and information to chemists and students. #1 - write a balanced chemical equation to . Chromium nitrate can be produced by combining chromium oxide in nitric acid solution. The Chromium Iii Sulfate Formula is Cr2(SO4)3. Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg. . The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. and 16.73g of ammonium nitrate or 11.18g of ammonium chloride is required. So, Molar mass of . La masa molar, por definicin, es la masa de un mol de un compuesto. Molar mass by definition is the mass of one mole of a compound. Putting the values in the formula. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. A common request on this site is to convert grams to moles. - . A 34.5-gram sample of lithium reacts with chromium(III) chloride. 5 H2O [250]g/mol (d) Na2HPO4 [142]g/mol Silber4 3.009a.EOCP. While heating, it turns from blue color to green color. chromium(III) sulfate(aq) +- object to be plated lead anode (i) Give two reasons why steel objects are plated with chromium. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. National Institutes of Health. A few materials, substances, compounds or elements with a name containing, like or similar to. Expert Answer. Chromium (III) sulfate most often appears as a blue-grey or violet-grey amorphous solid. The molecular formula of Chromium III Sulfate is Cr 2 (SO 4) 3. var tr_would_you_like_to_opt_out = "Would you like to opt out from selling your personal informaion for the purpose of ads personalization? Like other ionic compounds, it is a strong electrolyte that dissociates in aqueous solution to give hydrated NH 4+ and Cr 2 O 72 ions: Equation 4.8 Convert 11.35 moles of carbon into atoms of carbon. Detailed notes and practice problems with work and explanations of Unit 1 general chemistry concepts. After dissolution and removal of excess S2O82, 3.000 g of Fe(NH4)2(SO4)26H2O was added. What is the oxidation number of phosphorus in H3PO4? Recently prepared samples or those that have been subjected to heat may contain a deep green-colored sulfato complex and are hygroscopic as a result. Purer samples can be dried to form a lighter-colored powder. What is the correct molar mass of Ag3PO4? In a polyatomic ion, the algebraic sum of the oxidation numbers of all atoms is equal to. Visit ChemicalBook To find more TRIS(ETHYLENEDIAMINE)CHROMIUM (III) CHLORIDE(16165-32-5) information like chemical properties,Structure,melting point,boiling point,density,molecular formula,molecular weight, physical properties,toxicity information,customs codes. "; Please enable JavaScript in order to use this website. The model baths were prepared from anhydrous sodium sulfate, sodium chloride, and chromium(III) chloride hexahydrate. 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Counting the number of atoms of each element in the compound. The molar concentration of chromium(III) ions is 0.240 M in a solution of chromium(III) sulfate. These relative weights computed from the chemical equation are sometimes called equation weights. What is the formula for copper (I) oxide? What is the name of the compound mad of zinc ions, Zn2+, and fluoride ions, F-? It is commonly used in tanning leather. More details . For finding the molar mass (molecular weight) of chemicals we need to use the periodic table of elements and finding atomic mass of each element.Dans cette vido, vous apprendrez dcouvrir la masse molaire des composs. Molecular formula: Cr 2 (SO 4) 3 Elements: Chromium (Cr) , Oxygen (O) , Sulfur (S) Molecular weight: 392.16 g/mol Molar volume: 130.199 cm/mol CAS Registry Number (CAS RN): 10101-53-8 Dissolve compounds in hot water apart and then mix solutions into one . Your Mobile number and Email id will not be published. What is the percentage composition of CuCl2 by mass? Para encontrar a massa molar (peso molecular) dos produtos qumicos, precisamos usar a tabela peridica dos elementos e encontrar a massa atmica de cada elemento.In diesem Video lernen Sie, wie Sie die Molmasse von Verbindungen herausfinden. Its hydrate form Cr2 (SO4)3.8H2O is soluble in water. What is the molar mass of tetraethyl lead, Pb(C2H5)4? Ammonium dichromate is an ionic compound that contains two NH 4+ ions and one Cr 2 O 72 ion per formula unit. The first step to finding the molar mass is to count the number of each atom present in a single molecule using the chemical formula, (Cr (H2O)6)2 (SO4)3: 2. Become a member. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. 2CrCl3 + 3H2SO4 Cr2(SO4)3 + 6HCl Physical properties of Chromium (III) Sulfate Molar mass- 392.16 g/mol (anhydrous) It is a Blue-gray solid Chemical Formula is Cr 2 (SO 4) 3 Melting Point - 90 C Boiling Point - greater than 700 C Chromium (III) sulfate usually refers to the inorganic compounds with the formula Cr 2 (SO 4) 3. x (H 2 O), where x can range from 0 to 18. Browse the list of PubChem . Scribd is the world's largest social reading and publishing site. Answer: Chromium nitrate (Cr (NO 3) 3) is a crystalline chromium compound that is easily dissolved in water. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. ( ) . ( ) , . Convert grams Cr2(SO4)3 to moles or moles Cr2(SO4)3 to grams, Molecular weight calculation: Track your food intake, exercise, sleep and meditation for free. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. For finding the molar mass (molecular weight) of chemicals we need to use the periodic table of elements and finding atomic. Chromium III Sulfate is non combustible. milliequivalent per liter [meq/l], microequivalent per liter [eq/l], nanoequivalent per liter [neq/l] and picoequivalent per liter [peq/l]. Home Chemistry Chromium(III) Sulfite. Home; About us; Membership & professional community; Campaigning & outreach; . Required fields are marked *. Q: Need the answers to these questions asap. 323.5 g/mol. What is the mass of 0.240 mol of glucose, C6H12O6? Also known as: Chromic sulfate; Dichromium trisulfate. It is very harmful to the environment and a major health hazard. Give the formula of chromium(III) sulfate. C = 2 x 12 = 24 O = 1 x 16 = 16 H = 4 x 1 = 4 Total mass = 40 amu To find the percent composition you divide each part by the whole and multiply by 100 to convert to a %. millimole per liter [mm/l], micromole per liter [m/l], nanomole per liter [nm/l] and picomole per liter [pm/l]. Molar mass of MnO2 = 86.94 g/mol . Chromium sulfate | Cr2 (SO4)3 - PubChem compound Summary Chromium sulfate Cite Download Contents 1 Structures 2 Names and Identifiers 3 Chemical and Physical Properties 4 Related Records 5 Chemical Vendors 6 Drug and Medication Information 7 Pharmacology and Biochemistry 8 Use and Manufacturing 9 Safety and Hazards 10 Toxicity 11 Literature milliequivalent per deciliter [meq/dl], microequivalent per deciliter [eq/dl], nanoequivalent per deciliter [neq/dl] and picoequivalent per deciliter [peq/dl]. When DFOB (270 M) was the only ligand present, dissolved Fe(III) and Cr(III) increased approximately 1000-fold and 16-fold, respectively, as compared to the ligand-free system, a difference we . I need 8.60 grams of ammonium sulfate (molar mass = 132 g/mol) for a reaction. 6. 4. What is the chemical formula for the compound made of tin(IV) ions and chloride, Cl-, ions? The chemical formula for chromium (III) sulfate is Cr2 (SO4)3. Find Atomic Mass of Each Element Next, using the periodic table, find the atomic mass in g/mol of each element: 3. Example Reactions: common chemical compounds. An ion of bromine with a single negative charge has the symbol and the name, The platinum(II) ion and the platinum(IV) ion. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. On this Wikipedia the language links are at the top of the page across from the article title. Which element has the same oxidation number in all of its compounds? To complete this calculation, you have to know what substance you are trying to convert. La massa molare per definizione la massa di una talpa di un composto. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. 51.9961*2 + (32.065 + 15.9994*4)*3. How many grams of lithium chloride are formed? millimole per milliliter [mm/ml], micromole per milliliter [m/ml], nanomole per milliliter [nm/ml] and picomole per milliliter [pm/ml]. See full answer below. Chromium III Sulfate is an inorganic ionic compound. Chromium(III) Sulfite Cr2(SO3)3 Molar Mass, Molecular Weight. By using this website, you signify your acceptance of Terms and Conditions and Privacy Policy.Do Not Sell My Personal Information Click to predict properties on the Chemicalize site, For medical information relating to Covid-19, please consult the. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Molecular Formula H N NiO Average mass 290.795 Da Monoisotopic mass 289.974365 Da ChemSpider ID 55538 - Charge More details: Names Properties Searches Spectra Vendors Articles More Names and Synonyms Database ID (s) Validated by Experts, Validated by Users, Non-Validated, Removed by Users Nickel (II) nitrate hexahydrate [Wiki] Chromium (II) nitrate finds limited uses in the dyeing industry. . Molar mass158.36 g/mol . Suppose that you have 12.7 moles of chromium(III) chloride (CrCly). One mole of potassium atoms has a mass of, A compound's molar mass is numerically equal to. 0.910 moles Na+ Explanation: You're dealing with a soluble ionic compound, so you know for a fact that it dissociates completely in aqueous solution to produce cations, which are positively charged ions, and anions, which are negatively charged ions. Name: Chromium(III) Sulfite. Question 2: Is Chromium (III) Nitrate soluble or insoluble? Finding the molar mass by means of calculating the sum of the atomic weight of the atoms, which form the compound multiplied by their numbers. This site explains how to find molar mass. (Use Avogadro's . The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Alias: Chromic Sulfite. The product of the molar mass of the compound and the moles of the substance are defined as mass. Molar Mass: 344.1818. The reason is that the molar mass of the substance affects the conversion. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. [1] (iii) Write the ionic half-equation for the reaction at the negative electrode . What is the correct stock name for SnBr4? (The molar mass of K2Cr2O7 is 294.2g), What is the mass of 4.80 mol of barium hydride, BaH2?, Using the stock system of nomenclature, Cr2(SO4)3 is named and more. Sulfate compounds are salts or esters of sulfuric acid formed by replacing one or both of the hydrogens with a metal. The molar mass of chlorine is: 2. Chromium(III) | Cr+3 | CID 27668 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. Cr2 (SO4)3 molecular weight Molar mass of Cr2 (SO4)3 = 392.18 g/mol This compound is also known as Chromium (III) Sulfate. To learn the formula of various chemical compounds, Subscribe to BYJUS now! gram per milliliter [g/ml], milligram per milliliter [mg/ml], microgram per milliliter [g/ml], nanogram per milliliter [ng/ml] and picogram per milliliter [pg/ml]. Calculate the mass in grams of 0.640 moles of manganese(II) sulfate. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. Your Mobile number and Email id will not be published. (c) between A\overrightarrow{\mathbf{A}}A and $\overrightarrow{\mathbf{B}} ; (d)$ it is a scalar and has no direction; ______________ Can contain RNA or DNA but is not living. Chromium(III) chloride and chromium(III) sulfate can be used in the manufacture of food for particular nutritional uses and in food supplements. Convert grams Chromium(III) Sulfate to moles. Upon heating, it turns from blue to green. It is used in leather tanning. . Carbon C = 2 12.0107 g/mol = 24.0214 g/mol, Hydrogen H = 4 1.00794 g/mol = 4.03176 g/mol, Oxygen O = 2 15.9994 g/mol = 31.9988 g/mol, Molar mass = 24.0214 + 4.03176 + 31.9988 = 60.05196 g/mol. The molar mass of chromium (II) nitrate is 176.0059 grams per mole. Sorption recovery of toxic ions - chromium (VI) and manganese (II) - from aqueous solutions with different acidity (0.001-0.5 M HCl) was investigated on cation and anion exchangers synthesized with long-chained cross-linking agents (LCA).The initial concentrations of Cr(VI) and Mn(II) were 1 g/L and 5 g/L, respectively.It was shown that the resins with LCA possess high ionic permeability . It is found in miscellaneous applications, such as catalysts, hardeners, mordents, crosslinking and binding agents. a. solid barium b. solid boron c. liquid acetone (C3H3O)\left(\mathrm{C}_{3} \mathrm{H}_{3} \mathrm{O}\right)(C3H3O) d. liquidoctane(C8H18)\text { liquid octane }\left(\mathrm{C}_{\mathrm{8}} \mathrm{H}_{\mathrm{18}}\right)liquidoctane(C8H18). Average mass 392.180 Da; Monoisotopic mass 391.736206 Da; ChemSpider ID 23304 - Charge. the charge on the atom. 5. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. How many moles of a compound are there in 15.0g of potassium dichromate, K2Cr2O7?