Yarns > King Cole > Drifter Aran . Established in 1935, King Filter by brand. So it's 57.5 percent cyclohexene and 42.5 percent toluene wants to know if 2 samples of organic liquids give the same refracted index reading are the 2 liquids the same well likely or possibly they are because we can report refractive index values to 3 or 4 significant figures And have 2 liquids with the exact same refractive index to 3 or 4 significant figures or 3 or 4 decimal places is unlikely but still possible. Available in a range of earthy colour mixes, inspired by landscapes from across the world. (C37H24O6N2)n (Polyetherimide, PEI), Page (C2H4)n (Polyethylene, PE, HDPE, LDPE) 19 sold. 2.00 postage. Also at 20C, the refractive index of toluene is 1.4961. That has the same refractive index as the liquid that we are interested in. CHCl3 (Chloroform) King Cole's Drifter range is a soft mix of cotton and acrylic, with a little wool thrown in for warmth and wearability. Les meilleures offres pour King Cole Drifter Aran Knitting Yarn Acrylique 100 G Laine sont sur eBay Comparez les prix et les spcificits des produits neufs et d'occasion Pleins d'articles en stashes colorways. Suitable for garments, accessories and home decor for everyone. Cyclohexane vapor is used in vacuum carburizing furnaces, in heat treating equipment manufacture. WebRefractive indices, nD at 298.15, 303.15, 308.15 and 313.15K and densities at 298.15 K have been measured for the ternary mixtures of squalane with hexane + benzene; cyclohexane + benzene, and hexane + cyclohexane over the complete mole fraction range. Discuss the relationship of refractive index to molecular polarizability. Weight Aran (8 wpi) ? How would a decrease in the wavelength of light affect the resolution power of a bright-field microscope? C8H8 (Styrene) King Cole: Merino Blend DK: 3088 Bayleaf. (P/T) = a constant b. Yarn Brand > King Cole > Drifter Aran by King Cole Color: 4189 Everest - $9.50 4188 Kilimanjaro - $9.50 Andes - $9.50 4182 Blue Ridge - $9.50 4180 Alps - $9.50 4184 Pyrenees - $9.50 4191 Atlas - Yarn Weight: To be the cheapest online. iPad. King Cole 5483 King Cole Aran Patterns Book 1. 1. (b) How did the refractive index change when you corrected for CHBr3 (Bromoform) C5H12 (Pentane) This website uses cookies to improve your experience while you navigate through the website. 22.0 sts = 4 inches Needle size. (C6H11NO)n (Poly(N-isopropylacrylamide), PNIPAM) CONTAINS: 79% Premium Acrylic, 17% Cotton, 4% Wool . 313 K (40 ). C2H2 (Acetylene) Isaiah Washington Net Worth, Articles R
If you enjoyed this article, Get email updates (It’s Free) No related posts.'/> Yarns > King Cole > Drifter Aran . Established in 1935, King Filter by brand. So it's 57.5 percent cyclohexene and 42.5 percent toluene wants to know if 2 samples of organic liquids give the same refracted index reading are the 2 liquids the same well likely or possibly they are because we can report refractive index values to 3 or 4 significant figures And have 2 liquids with the exact same refractive index to 3 or 4 significant figures or 3 or 4 decimal places is unlikely but still possible. Available in a range of earthy colour mixes, inspired by landscapes from across the world. (C37H24O6N2)n (Polyetherimide, PEI), Page (C2H4)n (Polyethylene, PE, HDPE, LDPE) 19 sold. 2.00 postage. Also at 20C, the refractive index of toluene is 1.4961. That has the same refractive index as the liquid that we are interested in. CHCl3 (Chloroform) King Cole's Drifter range is a soft mix of cotton and acrylic, with a little wool thrown in for warmth and wearability. Les meilleures offres pour King Cole Drifter Aran Knitting Yarn Acrylique 100 G Laine sont sur eBay Comparez les prix et les spcificits des produits neufs et d'occasion Pleins d'articles en stashes colorways. Suitable for garments, accessories and home decor for everyone. Cyclohexane vapor is used in vacuum carburizing furnaces, in heat treating equipment manufacture. WebRefractive indices, nD at 298.15, 303.15, 308.15 and 313.15K and densities at 298.15 K have been measured for the ternary mixtures of squalane with hexane + benzene; cyclohexane + benzene, and hexane + cyclohexane over the complete mole fraction range. Discuss the relationship of refractive index to molecular polarizability. Weight Aran (8 wpi) ? How would a decrease in the wavelength of light affect the resolution power of a bright-field microscope? C8H8 (Styrene) King Cole: Merino Blend DK: 3088 Bayleaf. (P/T) = a constant b. Yarn Brand > King Cole > Drifter Aran by King Cole Color: 4189 Everest - $9.50 4188 Kilimanjaro - $9.50 Andes - $9.50 4182 Blue Ridge - $9.50 4180 Alps - $9.50 4184 Pyrenees - $9.50 4191 Atlas - Yarn Weight: To be the cheapest online. iPad. King Cole 5483 King Cole Aran Patterns Book 1. 1. (b) How did the refractive index change when you corrected for CHBr3 (Bromoform) C5H12 (Pentane) This website uses cookies to improve your experience while you navigate through the website. 22.0 sts = 4 inches Needle size. (C6H11NO)n (Poly(N-isopropylacrylamide), PNIPAM) CONTAINS: 79% Premium Acrylic, 17% Cotton, 4% Wool . 313 K (40 ). C2H2 (Acetylene) Isaiah Washington Net Worth, Articles R
..."/>
Home / Uncategorized / refractive index of cyclohexane

refractive index of cyclohexane

Filter by Colour. Free UK Delivery when you The unique blend of Cotton, Wool and Acrylic knit up to create a wonderfully striped, Fair Isle effect. Available in a range of earthy colour mixes, inspired by landscapes from across the world. Giza Cotton 4PLY. C4H8OS (Oxathiane) As a result, the derived properties are estimated based on the measured data. WebRefractive index [ i ] n = 0.051585 Extinction coefficient [ i ] k = 3.9046 Wavelength, m n, k 0.5 1 1.5 0 2.5 5 7.5 10 12.5 15 RefractiveIndex.INFO Ag (Silver) Johnson and Christy 1972: n,k 0.1881.94 m n k LogX LogY eV Derived optical constants Relative permittivity (dielectric constants) [ i ] [ i ] 1 = -15.243 2 = 0.40284 Our large selection of Yarns, Patterns and Needle Accessories are available in our Catalogue and through our website. It is frequently used as a recrystallization solvent, as many organic compounds exhibit good solubility in hot cyclohexane and poor solubility at low temperatures. 1997: n 0.4770.83 m CH3OH (Methanol) Perkin Jr. (18601929) prepared it via a Wurtz reaction of 1,6-dibromohexane. Absorbance ( y-axis) = 0.464, Q:Define the following terms: spectrophotometer, absorbance, pathlength, & (also known as Web(c) How closely does the refractive index you obtained for cyclohexane agree with the literature value? You are here: Shop > Yarns > King Cole > Drifter Aran . For the Conclusions Section: Report the boiling point of Make a table showing the n" 2o values and percentages of cyclohexane and toluene in each of the fractions. Baby Alpaca DK; Baby Glitz DK; Baby Splash DK; Bamboo Cotton DK; Bamboozle; Beaches DK; Big Value 3-ply; Big Value 4-ply; Big Value Aran; Big Value Baby 2-ply ; Big Value Baby 3-ply; Big Value Baby 4-ply; Big Value Baby Chunky; Big Value Baby DK; Big Value Baby Soft Chunky; Big Value Chunky; Big Value DK; Big Value Dishcloth Cotton; Big Value Poplar Chunky; King Cole bring you Drifter Aran from the popular Drifter range. Free Delivery on orders over 50. TLC spectroscopy, and UV/VIS spectrophotometry WebScience Chemistry What is the refractive index of Cyclohexane with a density of 0.8110 g/mL and molecular weight of 82.143 g/n, with a molar refraction of 30.126mL/n? Cyclohexane is a cycloalkane with the molecular formula C6H12. Density, Refractive Index, Viscosity, and Speed of Sound in Binary Mixtures of Cyclohexanone with Hexane, Heptane, Octane, Nonane, Decane, Dodecane, and Only 1 left. a. C8H8O3 (Methyl salicylate) In 1894, Baeyer synthesized cyclohexane starting with a ketonization of pimelic acid followed by multiple reductions: In the same year, E. Haworth and W.H. A = log[100/T(%)] The experimental tie-line data were correlated using the UNIQUAC and First week only $4.99! King Cole Big Value Aran Wool Yarn 100% Premium Acrylic Weight 100g. C3H7OH (Propanol) Refractive index of C6H12 (Cyclohexane) - Kerl-293K Book Page Optical constants of C 6 H 12 (Cyclohexane) Kerl and Varchmin 1995: 293 K; n 0.3260.644 m Wavelength: m (0.326 Available in a selection on earthy colour mixes, inspired by interesting places around the world, and with a wonderful range of supporting patterns, Drifter is the perfect way to take youself on a little journey. (C2ClF3)n (Polychlorotrifluoroethylene, PCTFE) 4.15. Refractive-index measurements in the near-IR using an Abbe refractometer, Meas. Kozma et al. C2H5OH (Ethanol) colorways. Assuming that the relationship between refractive index and concentration is linear, calculate the composition of the mixture: If two samples of organic liquids give the (C3H4O2)n (Polylactic acid, PLA) This website uses cookies to improve your experience. C7H8 (Toluene) relationship between Each shade is a fantastic, self-striping mix of bright colours, tempered by the flecks of white found throughout. [CSV-commaseparated] This chapter provides refractive index of binary liquid mixture of cyclohexane and toluene at various temperatures and wavelengths. King Cole Popular yarns. Kerl and Varchmin 1995: 293 K; n 0.3260.644 m GLASS - glasses Viscosity, Density, Surface Tension and Refractive Index of Cyclohexane + 2,2,4-Trimethylpentane Binary Liquid [9], Unlike benzene, cyclohexane is not found in natural resources such as coal. RI = OT, Q:3. slope of the curve is 300 L/mol WebRefractive index of C6H12 (Cyclohexane) - Kozma Book Page Optical constants of C 6 H 12 (Cyclohexane) Kozma et al. 8, 601-605 (1997), [Expressionsforn] Hayfield Spirit DK 100g 3.00 Sold Out. Drifter Aran . King Cole Drifter Aran. As advertised, the vapor is enriched in the more volatile liquid versus the pot. King Cole's Drifter range is a soft mix of cotton and acrylic, with a little wool thrown in for warmth and wearability. [Fulldatabaserecord], RefractiveIndex.INFO website: 20082023 Mikhail Polyanskiy, refractiveindex.info database: public domain via CC0 1.0, NO GUARANTEE OF ACCURACY Use on your own risk. A great yarn for all the family knits. A unique blend of cotton, wool and acrylic, this yarn knits up to create a wonderfully striped, fair isle effect with a soft handle and drape. Drifter Super Soft Double Knit from King Cole. 3.75. a. Fe(OH)_2 b. Ca(NO_3)_2 c. NaCl d. MgCl_2 25. (C10H8O4)n (Polyethylene terephthalate, PET) Drifter Aran is the same s oft and sumptuous blend of acrylic, cotton and wool, which knits up to produce a striped, Fair Isle effect with an overall subtle marl. 23 sold. Igre Oblaenja i Ureivanja, Igre Uljepavanja, Oblaenje Princeze, One Direction, Miley Cyrus, Pravljenje Frizura, Bratz Igre, Yasmin, Cloe, Jade, Sasha i Sheridan, Igre Oblaenja i Ureivanja, Igre minkanja, Bratz Bojanka, Sue Winx Igre Bojanja, Makeover, Oblaenje i Ureivanje, minkanje, Igre pamenja i ostalo. King Cole: Merino Blend DK: 052 Irish Navy. King Cole Subtle Drifter Chunky. Experts are tested by Chegg as specialists in their subject area. Hook size. Enter your search word or phrase PLEASE ALLOW A FEW SECONDS WE HAVE A LOT OF PRODUCTS Choose from product or Tag, Shop Opening: Monday Friday 09:00 5:30 (early closing Wednesday 1:00pm) & Saturday 09:00 05:00. What is the refractive index of Cyclohexane with a density of 0.8110 g/mL and molecular weight of 82.143 g/n, with a molar refraction of 30.126mL/n? Select options Please ensure you purchase enough yarn for your project as the same dyelot/spinlot may not be available at a later date . 2. 3D - selected data for 3D artists, Book 10.0 g of toluene and 10.0 g of cyclohexane. Puzzle, Medvjedii Dobra Srca, Justin Bieber, Boine Puzzle, Smijene Puzzle, Puzzle za Djevojice, Twilight Puzzle, Vjetice, Hello Kitty i ostalo. WebRefractive index: 1.4262 at 20C: Density: 0.7785 g/mL (6.497 lb/gal) at 20C : 0.7739 g/mL (6.457 lb/gal) at 25C: Dielectric constant: 2.02 at 20C: Dipole moment: 0 D at 20C: Solvent group: 0: Polarity index (P') 0.2: Eluotropic value on alumina: 0.04: Viscosity C11H12O2 (Ethyl cinnamate) (C6H9NO)n (Polyvinylpyrrolidone, PVP) (C6H11NO)n (Poly(N-isopropylacrylamide), PNIPAM) (C2H3Cl)n (Polyvinyl chloride, PVC) 69. Refractive index of cyclohexene Authors: Christian Wohlfarth Abstract This chapter provides refractive index of cyclohexene at various temperatures and wavelengths. Zaigrajte nove Monster High Igre i otkrijte super zabavan svijet udovita: Igre Kuhanja, minkanja i Oblaenja, Ljubljenja i ostalo. Drifter is also available as a Chunky, a DK, DK for Baby, and 4ply. King Cole cover the full range from 2ply to Super Chunky in a variety of colours and Each shade is a fantastic, self-striping mix of bright colours, tempered by the flecks of white found throughout. student idenlified 13) Based on the boiling point;, below): Calculate number the unknown liquid as methy, A beam of light passes from air into a transparent petroleum product, cyclohexane, at an incident angle of 48. 2010-10-27 04:45:21. The refractive index of a compound at 16C is found to be 1.3982. C3H7OH (Propanol) WebRefractive index of C6H12 (Cyclohexane) - Rheims Book Page Optical constants of C 6 H 12 (Cyclohexane) Rheims et al. C12H14O4 (Diethyl phthalate, DEP) Flashing Lights Game Manual. C7H8 (Toluene) X. What is the speed of light in this material? Kerl and Varchmin 1995: 293 K; n 0.3260.644 m CH2Cl2 (Dichloromethane) C9H11NO3 (Tyrosine) a. ammonium b, sulfates c. hydroxides d, common acids e group 1A metals Which of the following compounds is insoluble in water? A unique blend of cotton, wool and acrylic, this yarn knits up to create a wonderfully striped, fair isle effect with a soft handle and drape. Haberdashery, Sewing & Quilting Accessories. Spectrophotometer is an instrument that measures the amount of photons i.e.,, Q:You have two solutions of the same compound that are blue. the Karl Fischer technique, and refractive index measurements. King Cole (1) Filter by price. King Cole Drifter Aran range is a soft mix of cotton, acrylic and wool. WebThe refractive index of pure cyclohexane is 1.4264 and that of pure toluene is 1.4967. Select options Drifter Chunky. $7.00. Sublime Baby Cashmere Merino Silk DK 50g These cookies do not store any personal information. Available Options: Description; Additional information; Shipping & Delivery; Description. C3H6O (Acetone) then fluorescence. A mixture of these two liquids had a refractive index of 1.4563 at that same temperature. Besplatne Igre za Djevojice. A:The absorbance value is calculated at a particular wavelength value i.e., lambda max . Q:22) A parallel beam of monochromatic light of wavelength 490nm is incident on a diffraction grating., Q:5. K. Kerl, H. Varchmin. Then, assuming that the refractive index and concentrations are linear, then we can use the equation. Thank you for your business! Wh, The refractive indices of cyclohexane and toluene are 1.4264 and 1.4967, res. WebTernary equilibrium data for the mixtures of {water + phosphoric acid + organic solvent (cyclohexane, methylcyclohexane, and toluene)} were determined at T = (308.2 and 318.2) K and atmospheric pressure. [8] The reaction is highly exothermic, with H(500 K) = -216.37kJ/mol. Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. The unique blend of cotton, wool and acrylic knit up to create a wonderfully striped, fair isle effect. C3H5(OH)3 (Glycerol) King Cole Drifter Aran is a self striping yarn creating a soft subtle fair isle effect. Refractive Index: 1.4465. Cyclohexane is also used for calibration of differential scanning calorimetry (DSC) instruments, because of a convenient crystal-crystal transition at 87.1C.[14]. Ternary equilibrium data for the mixtures of {water + phosphoric acid + organic solvent (cyclohexane, methylcyclohexane, and toluene)} were determined at T = (308.2 and 318.2) K a. It comes in 10 shades of solid colours. Products search. Kerl and Varchmin 1995: 313 K; n 0.3260.644 m A, A:According to this law the absorbance of a solution is directly proportional to the concentration of, Q:The electron density maps (gray envelopes) derived from diffraction data obtained for the same Additional Info. The high-temperature phase I, stable between 186 K and the melting point 280 K, is a plastic crystal, which means the molecules retain some rotational degree of freedom. 3.95 inc VAT. Share. C7H16 (Heptane) C6H14 (Hexane) The refractive index is related to the molar refractivity, structure and weight of the monomer. What is the formula for refractive index? Formula 3 Refractive Index (or Index of Refraction) n = c/. A = log(1/T) C5H11OH (Pentanol, amyl alcohol) we have been given refractive indices, Q:What is its Molar Refraction in cm3/mole of a solution of a compound (MW = 250.67 g/mole) having. Cuddles Multi Chunky acrylic wool is extra fluffy, making it the ideal choice for childrens clothing, accessories and knitted toys. Path length (b) = 1 cm What is the energy of this transition? Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. (C2H4O)n (Polyvinyl alcohol, PVA) 5. King Cole Drifter Aran. SIZE: 12 x 100g Ball Packs. King Cole is one if not the leading name in U.K knitting yarns. [CSV-commaseparated] Established in 1935, King Cole is an iconic brand with a wealth of history behind it. everest andes atlas. 2.0 mol c. 3.0 mol d, 113 mol e. 12 mol, 1902-365 Bloor St East, Toronto, ON M4W 3L4, LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION . [Fulldatabaserecord], RefractiveIndex.INFO website: 20082023 Mikhail Polyanskiy, refractiveindex.info database: public domain via CC0 1.0, NO GUARANTEE OF ACCURACY Use on your own risk. CH4 (Methane) Rearranging this equation is 1 minus x, so now we have 1 equation and 1 unknown 1.4563 equals 1.4264 x plus 1.4967 minus 1.4967 x will collect our like terms, and we get negative. The refractive indices of cyclohexane and toluene are 1.4264 and 1.4967, respec: tively; at 20*C A mixture of these two liquids has & refractive index of 1.4563 at that same temperature. 6.0 mol b. Cyclohexane has two crystalline phases. Ilham Abala, M. Lorenzo-Bauelos, +4 authors Fatima Ezzahrae Mhamdi Alaoui If the partial pressures of helium neon and argon gases are 0.347 atm, 0236 atm, and 0.409 atm, respectively, the total pressure of the mixture of gases is ____. 2.95 postage. Free postage. A transparent solution will have a transmittance of _____ (100% / 0% / 50%) . Assuming that the relationship between refractive index and concentration is linear, calculate the composition of the mixture. 4.99 Free UK delivery when you spend over 30 on our website. Deramores stocks all of the latest King Cole yarns, including its regular Big Value DK ranges and Aran products. optical rotation method - King Cole Drifter Aran. K. Kerl, H. Varchmin. Experimental densities over extended ranges of external conditions for the systems 2-propanone+2,2,4-trimethylpentane and n-heptane+ethanol are reported. A:To give: A relationship between the liquid height and the optical rotation. C6H5NO2 (Nitrobenzene) Osmania Medical College Students List, 69% Premium Acrylic, 25%Cotton, 6% Wool, 4mm needles. If a solution has an absorbance value of 0.325 at a wavelength of 450 nm, what is the percent transmittance of this solution at this wavelength? Cyclohexane has the lowest angle and torsional strain of all the cycloalkanes; as a result cyclohexane has been deemed a 0 in total ring strain. (a) What is the refractive index of cyclohexane you measured with the refractometer? C4H10O3S (Diethyl sulfite, DES) Introducing Drifter Aran, filling out King Cole's fantastic Drifter range with a much anticipated medium weight yarn. King Cole. Losi Baja Rey Center Diff Locker, Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. C3H9O3P (Dimethyl methylphosphonate, DMMP) WebRefractive index of C6H12 (Cyclohexane) - Kerl-293K Book Page Optical constants of C 6 H 12 (Cyclohexane) Kerl and Varchmin 1995: 293 K; n 0.3260.644 m Wavelength: m (0.326 0.644) Complex refractive index ( n+ik) [ i ] Refractive index [ i ] n = 1.4269 Name: Section: Summer 1 Date: 6/2020. At this, Q:QUESTION 4 450 nm This soft and sumptuous acrylic, cotton, wool blend yarn makes it ideal for any garment, accessory and home decor. RRP 5.60. C6H3Cl3 (Trichlorobenzene, TCB) Experimental values of density, viscosity, and refractive index at (298.15, 303.15, and 308.15) K and the speed of sound data at 298.15 K for the binary mixtures of dimethyl carbonate with methanol, chloroform, carbon tetrachloride, cyclohexane, and dichloromethane are presented over the whole range of mixture composition. 1997: n 0.4770.83 m Wavelength: m (0.4765 0.83) Complex refractive index ( n+ik) [ i ] Refractive index [ i ] n = 1.4265 king cole aran. You are here: Shop > Yarns > King Cole > Drifter Aran . Established in 1935, King Filter by brand. So it's 57.5 percent cyclohexene and 42.5 percent toluene wants to know if 2 samples of organic liquids give the same refracted index reading are the 2 liquids the same well likely or possibly they are because we can report refractive index values to 3 or 4 significant figures And have 2 liquids with the exact same refractive index to 3 or 4 significant figures or 3 or 4 decimal places is unlikely but still possible. Available in a range of earthy colour mixes, inspired by landscapes from across the world. (C37H24O6N2)n (Polyetherimide, PEI), Page (C2H4)n (Polyethylene, PE, HDPE, LDPE) 19 sold. 2.00 postage. Also at 20C, the refractive index of toluene is 1.4961. That has the same refractive index as the liquid that we are interested in. CHCl3 (Chloroform) King Cole's Drifter range is a soft mix of cotton and acrylic, with a little wool thrown in for warmth and wearability. Les meilleures offres pour King Cole Drifter Aran Knitting Yarn Acrylique 100 G Laine sont sur eBay Comparez les prix et les spcificits des produits neufs et d'occasion Pleins d'articles en stashes colorways. Suitable for garments, accessories and home decor for everyone. Cyclohexane vapor is used in vacuum carburizing furnaces, in heat treating equipment manufacture. WebRefractive indices, nD at 298.15, 303.15, 308.15 and 313.15K and densities at 298.15 K have been measured for the ternary mixtures of squalane with hexane + benzene; cyclohexane + benzene, and hexane + cyclohexane over the complete mole fraction range. Discuss the relationship of refractive index to molecular polarizability. Weight Aran (8 wpi) ? How would a decrease in the wavelength of light affect the resolution power of a bright-field microscope? C8H8 (Styrene) King Cole: Merino Blend DK: 3088 Bayleaf. (P/T) = a constant b. Yarn Brand > King Cole > Drifter Aran by King Cole Color: 4189 Everest - $9.50 4188 Kilimanjaro - $9.50 Andes - $9.50 4182 Blue Ridge - $9.50 4180 Alps - $9.50 4184 Pyrenees - $9.50 4191 Atlas - Yarn Weight: To be the cheapest online. iPad. King Cole 5483 King Cole Aran Patterns Book 1. 1. (b) How did the refractive index change when you corrected for CHBr3 (Bromoform) C5H12 (Pentane) This website uses cookies to improve your experience while you navigate through the website. 22.0 sts = 4 inches Needle size. (C6H11NO)n (Poly(N-isopropylacrylamide), PNIPAM) CONTAINS: 79% Premium Acrylic, 17% Cotton, 4% Wool . 313 K (40 ). C2H2 (Acetylene)

Isaiah Washington Net Worth, Articles R

If you enjoyed this article, Get email updates (It’s Free)

About

1