Explain why Si has the lower density even though it has heavier atoms. (ii) Calculate the number of moles present in 160 gm of NaOH. Molar mass calculations are explained and there is a JavaScript calculator to aid calculations. (b) Calculate the percentage of (i) Fluorine (ii) Sodium (iii) Aluminium in sodium aluminium fluoride [Na 3 AlF 6] to the nearest whole number. Calculate the percentage of sodium in sodium aluminium fluoride (Na 3 AlF 6) correct to the nearest whole number. Calculate the density of barium. It is a simple ionic compound, made of the sodium (Na +) cation and fluoride (F-) anion.The solid salt exists as cubic crystals similar to the crystal structure of sodium chloride (NaCl). Aluminum (atomic radius = 1.43 Å) crystallizes in a cubic closely packed structure. The chemical formula for the compound could be written as the NaF and its molecular weight is 41.99 g/mol approximately. Aluminum fluoride, AlF 3, is used to make pure aluminum from oxidized aluminum. H2SO4 to each solution slowly. The one in which brown ring appears in NaNO3 solution while the other is NaCl solution. 42 45 2.2 Stannous Fluoride SnF 2 156.7 24 4.1 Conversion formula (3 easy steps) 1. (F = 19; Na =23; Al = 27) What is the percent yield of this reaction? asked Feb 28, 2019 in Chemistry by Anjal ( 76.8k points) mole concept Chemical formulae provide a way to represent any chemical substance using the symbol of the elements present in it. Then by the side of the test tube, pour conc. Add freshly prepared ferrous sulphate solution to the two solutions. Calculate the edge length of the face-centered cubic unit cell and the density of aluminum. It consists of an aluminum atom surrounded by three fluoride atoms, connected with covalent bonds. The density of aluminum is 2.7 g/cm 3; that of silicon is 2.3 g/cm 3. Provided below is a list of the chemical formulas of some common chemical compounds (along with their molecular weights). Formula and structure: The chemical formula of sodium fluoride is NaF and its molar mass is 41.99 g/mol. [Atomic Mass: Na = 23, Al = 27, F=19] (c) (i) State the volume occupied by 40 gm of methane at STP if its vapour density (VD)is 8. Na 2 CO 3 + 4 C + N 2 fi 2 NaCN + 3 CO Calculate the theoretical yield: 2 50.0 g N 2 1 mol N x 2 28.0 g N 2 mol NaCN x 2 1 mol N 49.0 g NaCN x 1 mol NaCN = 175 g NaCN Calculate the percent yield: ... 5.3 Sodium hydroxide solution (5 M NaOH): Dissolve 200 g of NaOH in sufficient reagent ... percent. 20.0 g of NaCN was produced. with the fact that aluminum-fluoride complex ions are approximately ten times more stable tha n co rresponding iron(III)-fluoride complex ions. Started 10-22-1995. This is an ionic compound where one sodium cation is connected with one Fluoride anion. If not, samples must be analyzed by the method of … Calculate the percentage of sodium in sodium aluminium fluoride (Na3AlF6 ) correct to the nearest whole number. 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