National Library of Medicine. An average Cl atom has a molar mass of 35.453 \ "g/mol", so the average molar mass of Cl_2 will be 35.453*2=70.906 \ "g/mol". Iodine can also be used for sterilization. Mercury(II) Iodide HgI2 Molecular Weight -- EndMemo What Is The Molar Mass Of Iodine Molecule? Molecular ... The reactants and products, along with their coefficients will appear above. To analyze chemical transformations, it is essential to use a standardized unit of measure called the mole. KE . Molarity (M) is a useful concentration unit for many applications in chemistry. of molec- molar mass of Hg I2 mass of Hg Iz x . The iodine tincture which is made of iodine and potassium . Answer: 3 question Rank the following in order of increasing molar mass: H2O2, I2, LiF, CH6N. Given the reaction 2 HI2 (arrows both ways) H2(g) + I2 (g) A sample mixture of HI, H2, and I2 at equilibrium was found to have H2 = 8.0 X 10-1 and HI = 7.0 x 10 -4 . The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). It has units of g mol-1 or kg mol-1. Molecular weight is actually an older term of "relative molar mass" or "molecular mass", which is a dimensionless quantity equal to the molar mass divided by the molar mass constant defined by 1 g/mol. Contact. Step 1: Get the formula correct. Conversion from grams to molecules requires two conversion factors. So, equivalent mass of $\ce{Na2S2O3}$ is equal to its molar mass, for molecular iodine it is half of its molar mass. Concept 3 . We may be able to balance a chemical equation and determine that one molecule of hydrogen combines with two of oxygen to make water (or the compound of your choice). What mass of sucrose (molar mass= 342.30 g/mol) would be needed to dissolve in 500.0 g of water? Explanation of how to find the molar mass of I2: Iodine gas.A few things to consider when finding the molar mass for I2:- make sure you have the correct chem. Iodine is an important nutrition. Molarity - Chemistry PDF Skills Worksheet Problem Solving Poutnik Poutnik. In the reaction of sodium thiosulphate with I2 in aqueous ... Solution We can solve this problem using the following steps. What is the molar mass of iodine? - Answers Since these two reagents . Free Flashcards about Chemisty Ch. 11 & 12 Key Takeaway. Dec 05,2021 - In the reaction of sodium thiosulphate with I2 in aqueous medium the equivalent weight of sodium thiosulphate is equal to:a)Molar mass of sodium thiosulphateb)The average of molar masses of Na2S2O3 and I2c)Half the molar mass of sodium thiosulphated)Molar mass of I2 x2Correct answer is option 'A'. Policies. Molar mass of KMnO 4 = 39.1 g + 54.9 g + (16.0 g x 4) Molar mass of KMnO 4 = 158.0 g; Use this number to convert grams to moles. Na fórmula química, você pode usar: Qualquer elemento químico. Limiting Reagent Calculator - ChemicalAid Iodine is a chemical element with the symbol I and atomic number 53. g = mols x molar mass = 0.705 x 253.8 = 179 g I2. Molar Mass of Al = 27g/mol. The molar mass of an element is its atomic weight in grams. FOIA. PDF Chapter 3 Molar Mass Calculation of Molar Masses we known, molarity (M) = no. Problem #11: What is the rate of effusion for a gas that has a molar mass twice that of a gas that effuses at a rate of 3.62 mol/min? Now, molecular iodine has a molar mass of 253.81 g mol−1, which means that every mole of iodine has mass of 253.81 g. In your case, the sample you're working with will have a mass of. The Avogadro's number is a dimensionless quantity and is equivalent to the Avogadro constant, which is 6.02 x 10^23 for one mole of a substance. A sample of uranium fluoride is found to effuses at the ... Use uppercase for the first character in the element and lowercase . It is calculated by multiplying the molar mass of each element by its stoichiometric amount in the compound and adding all of these masses together. Iodine I-131 is a radioactive isotope of iodine with an atomic mass of 131, a half life of eight days, and potential antineoplastic activity. Then, knowing that there are 6.022x10^23 molecules in one mol (Avogadro's number) you can find the number of molecules in however many mol of the substance that you have. However molar mass can also be calculated by multiplying the atomic mass in amu by the molar mass constant 1 gmol. 2Mg + O2 mc019-1.jpg 2MgO Fórmula no sistema Hill é I2: Calculando a massa molar (peso molar) To calculate molar mass of a chemical compound enter its formula and click 'Compute'. If he wishes to produce such a 0.2M solution he would weigh out the necessary mass of Na2S2O3.5H2O ( because that is what is commercially avail. I assigned the r 2 and MM 2 to the unknown gas so as to put x in the numerator. Molar mass of I2. Convert grams AlI3 to moles or moles AlI3 to grams. - I2 2.680 0.4521 - 10 2.908 0.4185 - 8 3.153 0.3879 - 6 3.413 0.3599 - 4 3.691 0.3344 - 2 3.983 0.3110 0 4.295 0.2895 2 4.625 0.2699 4 4.975 0.251 7 6 5.346 0.2351 8 5.736 0.2198 . How many moles of I2 will form 3.58 g of NI3? To calculate the limiting reagent, enter an equation of a chemical reaction and press the Start button. Get control of 2021! The freezing point apparatus consists of a freezing point test tube fitted with a stopper, a digital thermometer and a stirring wire. Forget 2020. Track your food intake, exercise, sleep and meditation for free. Re: Significant figures for molar mass. the molar mass of water is 18 g mol-1 molar mass = mass of one particle x Avogadro's constant (6.02 x . Write the half-reaction for the production of Zn at the cathode. Molar mass of solute = 0.5580 g solute = 153 g/mole 0.00365 mole solute PROCEDURE: 1. of molels volume in liter no. 508 g of I2 = 508/253.8 = ~2.0 moles. The relations among amount of substance (in moles), mass (in grams), and number of chemical entities From the equation, 2moles of Al reacted with 3 moles of I2. . Compound name is iodine. Department of Health and Human Services. The mole ratio between NaI to Cl_2 is 2:1, so two moles of sodium iodide are needed to react with one mole of chlorine. From your equation, for every 2 moles of NaI used, you produce 1 mole of I2, therefore you need 4 moles . Enter any known value for each reactant. (b) Calculate the molar mass of the unknown metal M. Number of moles of I = number of moles of M 1.284 g MI 1.021 g I = 0.263 g M Molar mass ofM = 0.263 g M 0.004023 mol M = 65.4 g/mol 1 point is earned for the number of grams of M. 1 point is earned for the molar mass. Zn 2+ (aq) + 2 e- Zn(s) Calculate the moles of e-required to produce the moles of Zn using the stoichiometry of the balanced half-reaction. Use uppercase for the first character in the element and lowercase for the second character. 8. 2Al + I2 —>Al2I6. H 3 PO 4 = 3H, 1P, 4O 1 mol H 3 PO 4 = 3mol H = 3 x 1.008 g/mol = 3.024 1mol P =1 x 31.0 g/mol = 31.0 4molO = 4 x 16.0 g/mol = 64.0 3) Square both sides, then continue on to the value for x: 0.0553633 = x / 253.809 x = 14.0 Obtain from the stockroom a nickel spatula, a timer, and a freezing point apparatus. moles of KMnO 4 = 23.7 g KMnO 4 x (1 mol KMnO 4 /158 grams KMnO 4) moles of KMnO 4 = 0.15 moles KMnO 4; Now the liters of solution is needed. The molar mass of iron can be used to convert mass of iron to amount of iron in moles. 2. This compound is also known as Aluminium Iodide. - mass, molar density (1 /v, 116) Subscripts c -refers to a property in the critical state . Molar mass HNO 3: 1.008 g/mol + 14.01 g/mol + ( 3 x 16.00 g/mol ) = 63.02 g/mol 63.02 g HNO 3 1 mol HNO 3 16. How many moles of I2 will form 3.58 g of NI3? 8600 Rockville Pike, Bethesda, MD, 20894 USA. 1 mol Fe 55.85 g Fe 388.2 g Fe 6.951 mol Fe multiply by the inverse molar mass of Fe Mass of Fe in g 1 Amount of Fe in mol 2 1 molar mass Fe given 1 mol Fe g Fe mol . The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant, M u = 0.999 999 999 65 (30) × 10 −3 kg⋅mol −1. This problem has been solved! C. The molar mass of nitrogen (N2) is 28.02 g/mol. I2 is a metallic gray solid at room temperature. • CaI2 + Hg(NO3)2 = HgI2 + Ca(NO3)2 A sample of N2 gas is contaminated with a gas (A) of unknown molar mass. The molar mass of iodine is 254 g/mol. These molar masses are arbitrary values, we just need MM 2 to be twice the value for MM 1. how many moles of i2 will form 3.58 g of ni3? Molar mass of I2 = 253.80894 g/mol. Molar mass of AlI3 = 407.694948 g/mol. (The test tube is clean. Iodine. Compound. molar mass of I2 = 253.8. 1 mol C 5H 12 72.15 g C 5H 12 Mass - mass calculation: Another example How many grams of carbon dioxide are produced by the complete combustion of 100. g of pentane (C 5H 12)? What is the mass, in grams, of 4.60 mol of N2? >. Molecular iodine, 12 (Molar mass 253.81 g/mol) is produced by the reaction of 2.91 g of CuCl2 (Molar mass = 134.45 g/mol) according to the following equation: 2 CuCl2 + 4 KI - How many grams of I2 is produced? Answer (1 of 4): I have never seen a chemist , when making up a standard solution of sodium thiosulphate to mark the container as :"0.2M Na2S2O3.5H2O" . Molar Mass The molar mass of a substance is the sum of the molar masses of its atoms (using formula). The limiting reagent will be highlighted. Convert grams I2 to moles or moles I2 to grams. 24.4k 2 2 gold badges 31 31 silver badges 66 66 bronze badges Explanation of how to find the molar mass of PbI2: Lead (II) iodide.A few things to consider when finding the molar mass for PbI2:- make sure you have the co. .000146612 mols KIO3 x (3 mols I2/1 mol KIO3) x (2 mols S2O3^-2/1 mol I2) mols = .000887972 mols S203^2-Then M S2O3^-2 = .000887972 mols/0.02715 L. M = 0.032400 Therefore the Molar mass of Na2S2O3 is 0.032400 Improve this answer. Molar Mass: 253.8089. Find the mole fraction of the solvent. iron(II) bromide = FeBr 2 = Fe 2 . How many moles of I2 will form 3.58 g of NI3? Calculate the molar concentration of I2 in the equilibrium mixture. A chemist starts with 2.00 grams of salicylic acid and reacts it with excess acetic anhydride. Moles. E) 130. g sucrose: 64) Determine the boiling point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). That's the LOOOOng way of doing it. Track your food intake, exercise, sleep and meditation for free. Therefore, n-factor of $\ce{I2}$ is $2$, n-factor of $\ce{Na2S2O3}$ is $1$. The additional Thiosulfate ion breaks the I2 + starch complex down, and with the disappearance of the blue color (caused by the combination of I2 and starch) we can observe the endpoint, the amount of thiosulfate ion needed to react with I2, and the concentration of I2. The molar mass of Iodine = 126.90447 g/mol. Mass of Al = 10g. Instructions. Answer: 2 question The chemical equation below shows the decomposition of nitrogen triiodide (NI3) into nitrogen (N2) and iodine (I2). e.g. Pure acetic acid, known as glacial acetic acid, is a liquid with a density of 1.049 g/mL at 25°C. of molelo molarity x volume in liter = 5.22x101) mollit * 0.225 Lt & = 1.1745x10" molese, We knowsh, mass of Hg F2 no. Find the mole fraction of the solvent. A 0.500-L vinegar solution contains 25.2 g of acetic acid. (Answer to 2 decimal places) 2 Cul + 4 KCI +12 Type your answer. What is the molar mass of this compound? Mercury(II) Iodide HgI2 Molar Mass, Molecular Weight. SO - X A chemist adds 225 ml of a 3.22x105 UM Hg I2 we known, I I MM = 106m 5-22X10SAME &•22x105x10-6 M . So, Carbon would be 12.01. Molar mass = 12.0 +2(16.2) = 44.0 g/mol # of CO 2 molecules = 1.75 mol 23 6.02x10molecules CO x 2 1 mol 24 = 1.05x10molecules (3 sig figs) d) Number of mole of H atoms in 20.0 g of CH 4 Molar mass = 12.0+ 4(1.01)= 16.0 g/mol # of CH 4 molecules = 20.0 g CH 1 mol x 4 16.0 g Molar Mass: When masses of each constituent atoms forming a molecule is added simultaneously involving multiplication with the count of a specified atom, the quantity so obtained is named as molar . 2) The gas that has twice the molar mass is the one whose rate we are trying to determine. When 1.20 g of Sb and 2.4 g of I2 are mixed mass of SbI3 from Sb = 1.20 g Sb x 1 mol Sb x 2 mol SbI 3 x 502.5 g SbI 3 = 4.95 g SbI3 121.8 g Sb 2 mol Sb 1 mol SbI3 mass of SbI3 from I2 = 2.40 g I2 x 1 mol I2 x 2 mol SbI3 . Molar mass Molar ratio 180.1 g mol C6H12 O6 = 2.33 mol O Strategy: Once the number of moles of a substance present is known, we can use: - Molar mass to find the number of grams - Avogadro's number to find the number of atoms, ions, or molecules Moles B Grams B Atoms B Molar mass NA Moles A Molar Ratio Molar Conversions Chapter 3 H? The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. • CaI2 + Pb(NO3)2 = Ca(NO3)2 + PbI2 ↓ • 2 NH4I + Pb(NO3)2 = PbI2 ↓ + 2 NH4NO3 moles of KMnO 4 = 23.7 g KMnO 4 x (1 mol KMnO 4 /158 grams KMnO 4) moles of KMnO 4 = 0.15 moles KMnO 4; Now the liters of solution is needed. n = Mass /Molar Mass. . According to the equation 2 moles of electrons will produce one mole . 5. The molar mass, MM, in grams per mole, is numerically equal to the sum of the masses (in amu) of the atoms in the formula. Forget 2020. Examples: Fe, Au, Co, Br, C, O, N, F. You can use parenthesis or brackets []. You must take the mass you have of I2 and multiply by the molar mass of I2.The limiting reagent is the substance of fewer moles. Calcuate the molar mass of I2 from the equilibrium formula. Molar mass of I2 (s) Molar mass of I2 (s) is 253.808940 ± 0.000060 g/mol. 2NI3 —> N2 + 3I2The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 - the answers to estudyassistant.com Compound. Molar mass is an important concept in adapting chemical formulas to real world conditions. Convert between I2 (s) weight and moles. Molecular weight calculation: 26.981538 + 126.90447*3. Lead(II) Iodide PbI2 Molar Mass, Molecular Weight. In my chemistry discussion this morning, my TA informed our class that we will be given a periodic table to use during the test. It is slightly soluble in water. Previous. The iodine tincture which is made of iodine and potassium . 6 Stoichiometry The steel industry relies on the reaction between iron(III) oxide and carbon to produce iron and CO 2. Keep in mind, this is the total volume of the solution, not the volume of . To balance it, put 3 in front I2 as shown below: 2Al + 3I2 —>Al2I6. MOLAR MASS The mass of one mole of substance. Molar Mass iron(II) bromide = 215.65 g/mol Feedback: The molar mass of a compound is the mass in grams of one mole of the compound. Both will have the same numeric value for a given chemical substance but molecular mass will have the units of amu and molar mass will have the units of g/mol. Molar Mass of Fe 2O3 = 2 (55.85 g/mole) + 3 (16.0 g/mole) = 159.7 g Fe 2O3/mole Stoichiometry Chapter 4 x 4 Fe + 3 O 2 2 Fe 2O3. 0 0 7 7 g m L − 1. 2538089 I2 is a metallic gray solid at room temperature.Molecular iodine Iodine 7553-56-2 12190-71-5. 129. Calculate the molarity of a solution of glycerol made by dissolving 50.000 mL glycerol at 15°C in enough water to make 250.00 mL of solution. I2 is a metallic gray solid at room temperature. Grams . Solution: 1) Set rates: rate 1 = 3.62 rate 2 = x . Iodine | I2 - PubChem. It is slightly soluble in water. The molar mass of i2 is 253.80 g/mol, and the molar mass of ni3 is 394.71 g/mol. Convert between I2 weight and moles CompoundMolesWeight, g. Elemental composition of I2 ElementSymbolAtomic weightAtomsMass percent. Convert the mass of Zn produced into moles using the molar mass of Zn. Its melting point is 113.7 ̊C (236.66 ̊F), boiling point 184.3 ̊C (363.74 ̊F), density 4.933 g/cm3. The molar mass of methanol is 32.0 g/mol. The molar mass is the mass of 1 mole of a chemical entity. The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance. C. 0.0136. National Center for Biotechnology Information. I'm sure your prof (or the one who made up the problem) wants you to recognize that 1 mol of Cl2 = 1 mol I2 = 1 mol H2 and they all contain the same number of molecules and that is 6.02E23 (They have difference masses . The molar mass of gas A is: a) 3.11 b) 252 c) 84.0 d) 9.33 e) none of these 3.30 ⋅ 1025 molecules I2 ⋅ Avogadro's number 1 mole I2 6.022 ⋅ 1023 molecules I2 = 54.8 moles I2. The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. Depends on the periodic table given. Molecules are converted to moles and vice versa using the Avagadro's number. molarity (M)= 5.22x10-11 M volume = 225 ml = 0.225 liter. National Institutes of Health. He said that it would most likely go to two significant figures. Finding Molar Mass. 0.0136 D. A chemist has 2.0 mol of methanol (CH3OH). 000907 000940 00136 00212. Iodine is an important nutrition. Sample Calculation (for Group 3) 1L 1 mol S2 O3 1 mol I2 2 mol Cu moles Cu = 33.6 mL x x 0.1026 M Na2 S2 O3 x x x = 3.4474 x10−3 1000 mL 1 mol Na2 S2 O3 2 mol S2 O3 1 mol I2 Calculation for the unknown mass of copper sample The unknown mass of copper sample was calculated by multiplying the calculated number of moles of . An aqueous solutions of diabasic acid (molecular mass = 1 1 8) containing 3 5. Molar mass of i2. Calculating Molar Concentrations from the Mass of Solute Distilled white vinegar ( Figure 2 ) is a solution of acetic acid, CH 3 CO 2 H, in water. For normal samples from earth with typical isotope composition, the atomic weight can be approximated by the standard atomic weight or the conventional atomic weight.. Compound name is iodine. Molecules To Moles Calculator. •The molar mass (M) of a substance is the mass of one mole of entities (atoms, molecules, or formula units) of the substance. Molar mass of NaI = 149.9. Answer: Graham's law of effusion is based on the equation for kinetic energy because two gases at the same temperature have the same average kinetic energy. Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of iodine is 253.808940 ± 0.000060 g/mol. Kb (water) = 0.512°C/m. The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at three times the rate of N2. The partial pressure of each gas is known to be 200 Torr at 25°C. Glycerol is a water-soluble liquid with a density of 1.2656 g/L at 15°C. .009070.009400.01360.0212 The molar mass of a molecule or compound is the sum of the subscripts times the molar masses . MM 2 = 2 MM 1 = 1 . First, the molar mass allows you to change mass into mol. Convert between I2 weight and moles. The molar mass of I 2 is 253.809 and the molar mass of the unknown is x 1 / 4.25 = x / 253.809. Share. Selectively accumulating in the thyroid gland, iodine I 131 emits beta and gamma particles, thereby killing thyroid cells and decreasing thyroid hormone production. Get control of 2021! Read our article on how to calculate molar . Aspirin (C 9 H 8 O 4, molar mass = 180.1 g/mol) can be prepared by the reaction of salicylic acid (C 7 H 6 O 3, molar mass = 138.1 g/mol) with acetic anhydride (C 4 H 6 O 3), according to the following equation. Also, there are 6 atoms of I on the right side and 2 on the left side. A. I2< LiF < H2O2 < CH6N B. LiF < CH6N C. H2O2 < LiF < I2 < CH6N D. CH6N < H2O2 < I2 < LiF - the answers to estudyassistant.com COMPUTE EVALUATE Are the units correct? 3.5 The mole maintains the same mass relationship between macroscopic samples as exist between individual chemical entities. The heaviest of the stable halogen s, it exists as a semi-lustrous, non-metallic solid at standard condition s that melts to form a deep violet liquid at 114 degrees Celsius, and boils to a violet gas at 184 degrees Celsius. . The addition of this starch will yield a blue color. Molar mass of I2 is 253.808940 ± 0.000060 g/mol. Keep in mind, this is the total volume of the solution, not the volume of . I2. That's 4.245E23/6.02E23 = 0.705 mols I2. . Molar mass of KMnO 4 = 39.1 g + 54.9 g + (16.0 g x 4) Molar mass of KMnO 4 = 158.0 g; Use this number to convert grams to moles. Molecular weight calculation: 126.90447*2. 4 g of acid per litre of the solution has density 1. • Molar mass has units of grams per mole (g/mol). InChI=1S/I2/c1-2 It can provide a way to encode the molecular information of Iodine to facilitate the search for the compound . Yes; the answer has the correct units of moles of Fe. Molar Mass: 253.8089. Molarity is defined as the number of moles of solute in exactly 1 liter (1 L) of the solution: A 355-mL soft drink sample contains 0.133 mol of sucrose (table sugar). Its melting point is 113.7 ̊C (236.66 ̊F), boiling point 184.3 ̊C (363.74 ̊F), density 4.933 g/cm3. Iodine can also be used for sterilization. It will calculate the total mass along with the elemental composition and mass of each element in the compound. Determination of a Molar Mass from a Freezing Point Depression A solution of 4.00 g of a nonelectrolyte dissolved in 55.0 g of benzene is found to freeze at 2.32 °C. Follow answered May 14 '19 at 5:34. The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. MOLES The mole • the standard unit of amount of a substance (mol) • the number of particles in a mole is known as Avogadro's constant (NA) • Avogadro's constant has a value of 6.02 x 1023 mol-1. n = 10/27 = 0.37mol. 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To analyze chemical transformations, it is essential to use a standardized of... One mole of moles of I2 from the stockroom a nickel spatula, a timer, and a point... Glacial acetic acid, is a metallic gray solid at room temperature.Molecular iodine iodine 7553-56-2 12190-71-5 calculate of... Bethesda molar mass of i2 MD, 20894 USA mass into mol a solution < /a > mass... Of Fe 184.3 ̊C ( 236.66 ̊F ), density 4.933 g/cm3 to.... Href= '' https: //www.answers.com/Q/What_is_the_molar_mass_of_iodine '' > Chapter4 < /a > Lead ( II ) Iodide PbI2 mass! The Avagadro & # x27 ; 19 at 5:34 Set rates: rate 1 3.62... Be twice the molar mass of nitrogen ( molar mass of i2 ) is 28.02 g/mol compound is the mass... Best Answer ] balance the chemical equation below shows the burning of magnesium ( )! Per mole ( g/mol ) ( II ) Iodide PbI2 molar mass has units grams. Temperature.Molecular iodine iodine 7553-56-2 12190-71-5 '' > OWL required part3 - myqnt1notes - Google search < /a > the! Between I2 weight and moles iodine | I2 | ChemSpider < /a > molar mass constant 1 gmol chemist with... Convert between I2 weight and moles CompoundMolesWeight, g. elemental composition of I2 encode the molecular of!, along with their coefficients will appear above are 6 atoms of I on the side. = 5.22x10-11 M volume = 225 ml = 0.225 liter of iodine potassium! The limiting reagent, enter an equation of a solution < /a > Lead ( II Iodide! Convert grams I2 to moles or moles AlI3 to grams stirring wire <. To real world conditions of g mol-1 or kg mol-1 2 = x to put x in the numerator has! Mol-1 or kg mol-1 you to change mass into mol form magnesium oxide ( MgO ) burning of magnesium Mg. These molar masses are arbitrary values, we just need MM 2 to 200!
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molar mass of i2