In the same way, a solid understanding of boiling point elevation and freezing point depression can help you determine the molecular mass of a mystery compound that’s being added to a known quantity of solvent. Directions (31–50): For each statement or question, select the word or expression that, of those given, best completes the statement or answers the question. 2. 2-chloro-2-methylbutane contains some molecules with a molar mass of approximately and some with a molar mass of approximately . Molecular formula: Sb 2 S 3. Step 1. molar mass of Sb2S3 = 340 g mol The … Molar mass of Sb2S3 = 340g The stibnite was 500 % (!) Definitions of molecular mass, molecular weight, molar mass and molar weight. In a compound of NaOH, the molar mass of Na alone is 23 g/mol, the molar mass of O is 16 g/mol, and H is 1 g/mol. 4. This is defined as 0.001 kilogram per mole, or 1 gram per mole. Examples: Fe, Au, Co, Br, C, O, N, F. You can use parenthesis or brackets []. Molar mass: 339.715 Appearance grey / black orthorhombic crystal (stibnite) Density: 4.562g cm −3 (stibnite) Melting point: 550 °C (1,022 °F; 823 K) (stibnite) Boiling point: 1,150 °C (2,100 °F; 1,420 K) 67.Show a correct numerical setup for calculating the atomic mass of antimony. Ch. The unbalanced equation below represents one of the reactions that occurs during the roasting. Molar mass: 339.715: Appearance: grey / black orthorhombic crystal (stibnite) Density: 4.562g cm −3 (stibnite) [1] Melting point: 550 °C (1,022 °F; 823 K) (stibnite) [1] Boiling point: 1,150 °C (2,100 °F; 1,420 K) 2 - Calculate the molar mass of each of the following... Ch. One mole of a substance is equal to a very large number, 6.023 x 10 23 of atoms (or molecules) which the substance is made of. A 6.35-g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3 (aq). Convert the grams into moles. 2 - Calculate the molar mass of each hydrated... Ch. Convert 15.0 g Sb2S3 to moles. Molecular formula: Sb 2 S 3. 3(a). The number of moles represents the fraction: mass of the compound / molecular weight of the compound. 0.348 g of X was injected into a gas syringe maintained at a temperature of 90 °C and a pressure of \(1.01 \times {10^5}{\text{ Pa}}\). This is the theoretical yield. What is the molar mass of NaOH? 2 - Calculate the molar mass of each hydrated... Ch. For example: To convert grams to moles, the molecular weight of the solute is needed. 66.Determine the percent composition by mass of antimony in stibnite (gram-formula mass = 340. g/mol). Answer to What mass of antimony is contained in 106 grams of stibnite, Sb_2, S_3? g = moles x molar mass. Stibnite typically contains 5% of Sb2S3.Antimony can be obtained by reducing Sb2S3 with scrap iron. The fraction of iron reacted is 0.1. moles = grams/molar mass. The Sb3 (aq) is completely oxidized by 27.7 mL of a 0.130 M aqueous solution of KBrO3(aq). Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix. ; We know that we will need a balanced equation with masses, moles, and molar masses of the compounds involved.. [2] [Total 3 marks] 6. Antimony can be obtained by reducing Sb2S3, with scrap Iron Sb2S3 + 3Fe -----> 2Sb + 3 FeS (i) How many moles on Sb2S3 are in 500kg of a typical sample of stibnite containing 5% by mass of Sb2S3? Now that you have the molar mass of the solute, you need to multiply the number of grams of solute in the solution by a conversion factor of 1 mole over the formula weight (molar mass) of the solute. The problem states that 9.84 g is the actual yield. Molar … Melting Point (MP), Antimony sesquisulfide, stibnite changes its state from solid to liquid at 550°C (1022°F or 823.15K) Also known as: Antimony sulfide, stibnite; Antimony trisulfide, stibnite. 3. Mass magnetic susceptibility: 10.9×10-9 m 3 /kg Molar magnetic susceptibility: 1.327×10-9 m 3 /mol. Forsterite Mg2SiO4 Molar Mass, Molecular Weight. Colloform - Forming from a gel or colloidal mass. The molar mass given compound stibnite S b 2 S 3 is 339.7 g / m o l. The mass percent of antimony in S b 2 S 3 can be calculated as follows, Molar … Molar Mass = Mass of the Substance (Kg)/Amount of Substance (Mol) Mole or mol is the unit used to measure the amount of a substance. This converts atomic units to grams per mole, making the molar mass of hydrogen 1.007 grams per mole, of carbon 12.0107 grams per mole, of oxygen 15.9994 grams per mole, and of chlorine 35.453 grams per mole. Sb2S3 3Fe 2Sb 3FeS (i) How many moles of Sb2S3 are in 500 kg of a typical sample of stibnite containing 5% by mass of Sb2S3? Stibnite typically contains 5% of Sb2S3. %yield = (actual yield/theoretical yield)*100 = ?? By Peter J. Mikulecky, Chris Hren . 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