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ابي مساعدتكم .. كثافة الميثانول!!!

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  1. [1]
    طعيميس
    طعيميس غير متواجد حالياً

    جديد

    تاريخ التسجيل: Mar 2007
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    ابي مساعدتكم .. كثافة الميثانول!!!

    مساء الخير لكل الاعضاء ..


    بأختصار انا كاتب الموضوع وقد يكون تافه لاكن عن جد متورط فيه ..



    انا بأختصار محتاج كثافة الميثانول في الطور الغازي ..


    ياليت احد يقدر يزودني بأي شي عن هالذا الموضوع ... موقع او جدول للكثافه اي اي شي .



    I need to density of methanol in the gas phase ...pleas help me










  2. [2]
    mahelosta
    mahelosta غير متواجد حالياً
    عضو


    تاريخ التسجيل: Mar 2009
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    الكثافة النوعية = 0.792

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  3. [3]
    محمد الاكرم
    محمد الاكرم موجود حالياً
    عضو متميز
    الصورة الرمزية محمد الاكرم


    تاريخ التسجيل: Sep 2008
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    السلام
    لك اخي خصاءص الميثانول
    http://www.methanex.com/products/doc...ISH_french.pdf
    http://www.economicexpert.com/a/Methanol.htm
    اما كثافة اي غاز بالنسبة للهواء تعطى بالعلاقه التالية
    ك= م/29
    م: الكتله المولية
    م=32.04
    ومنه
    ك= 32.04/29=1.10
    وفقك الله

    0 Not allowed!



  4. [4]
    طعيميس
    طعيميس غير متواجد حالياً
    جديد


    تاريخ التسجيل: Mar 2007
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    يعطيكم العافيه .. اعزائي


    الكثافه النوعيه اعتقد تستخدم لسوائل والمواد الصلبه ... ممكن انا غلطان


    لا تبخلو علينا يالباقين ^_^

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  5. [5]
    حسام النجار
    حسام النجار غير متواجد حالياً
    عضو


    تاريخ التسجيل: Aug 2008
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    Methanol

    From Wikipedia, the free encyclopedia


    Jump to: navigation, search
    Not to be confused with Menthol.
    For climate changing methane-water "ice", see Methane clathrate.
    For resolution of hydrate / clathrate confusion, see hydrate.
    Methanol







    IUPAC name
    [show]
    methanol

    Other nameshydroxymethane
    methyl alcohol
    methyl hydrate
    wood alcohol
    carbinolIdentifiersCAS number[67-56-1]RTECS numberPC1400000SMILES
    ChemSpider ID864PropertiesMolecular formulaCH3OHMolar mass32.04 g/molAppearancecolorless liquidDensity0.7918 g/cm³, liquidMelting point–97 °C, -142.9 °F (176 K)
    Boiling point64.7 °C, 148.4 °F (337.8 K)
    Solubility in waterFully miscibleAcidity (pKa)~ 15.5Viscosity0.59 mPa·s at 20 °CDipole moment1.69 D (gas)HazardsMSDSExternal MSDSEU classificationFlammable (F)
    Toxic (T)NFPA 704
    3
    3
    1

    R-phrasesR11, R23/24/25, R39/23/24/25S-phrases(S1/2), S7, S16, S36/37, S45Flash point11 °CRelated compoundsRelated alkanolsethanol
    propanol
    butanolRelated compoundschloromethane
    methoxymethaneSupplementary data pageStructure and
    properties
    n, εr, etc.Thermodynamic
    data
    Phase behaviour
    Solid, liquid, gasSpectral dataUV, IR, NMR, MSExcept where noted otherwise, data are given for
    materials in their standard state
    (at 25 °C, 100 kPa)

    Infobox referencesMethanol, also known as methyl alcohol, carbinol, wood alcohol, wood naphtha or wood spirits, is a chemical compound with chemical formula CH3OH (often abbreviated MeOH). It is the simplest alcohol, and is a light, volatile, colourless, flammable, toxic liquid with a distinctive odor that is very similar but slightly sweeter than ethanol (drinking alcohol).[1] At room temperature it is a polar liquid and is used as an antifreeze, solvent, fuel, and as a denaturant for ethanol. It is also used for producing biodiesel via transesterification reaction.
    Methanol is produced naturally in the anaerobic metabolism of many varieties of bacteria, and is ubiquitous in the environment. As a result, there is a small fraction of methanol vapor in the atmosphere. Over the course of several days, atmospheric methanol is oxidized by oxygen with the help of sunlight to carbon dioxide and water.
    Methanol burns in air forming carbon dioxide and water:
    2 CH3OH + 3 O2 → 2 CO2 + 4 H2O A methanol flame is almost colorless in bright sunlight conditions, causing an additional safety hazard around open methanol flames.
    Because of its toxic properties, methanol is frequently used as a denaturant additive for ethanol manufactured for industrial uses— this addition of methanol economically exempts industrial ethanol from the rather significant 'liquor' taxes that would otherwise be levied as it is the essence of all potable alcoholic beverages. Methanol is often called wood alcohol because it was once produced chiefly as a byproduct of the destructive distillation of wood. It is now produced synthetically by a multi-step process: natural gas or coal gas and steam are reformed in a furnace to produce hydrogen and carbon monoxide; then, hydrogen and carbon monoxide gases react under pressure in the presence of a catalyst. Methanol is also produced from the gasification of a range of renewable biomass materials, such as wood and black liquor from pulp and paper mills.
    *******s

    [hide]

    hosam elnaggar

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