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Date: 12-1-2018
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Date: 30-3-2019
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Date: 30-12-2018
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Physical properties of Dihydrogen
Dihydrogen is a colourless, odourless gas, sparingly soluble in all solvents, and at 298K and 1 bar pressure, it conforms closely to the ideal gas laws. The solid state structure of H2, can be described in terms of an hcp lattice (see Section 5.3), but values of the melting point, enthalpy of fusion, boiling point and enthalpy of vaporization are all very low, consistent with there being only weak van der Waals forces between the H2 molecules. The covalent bond in H2 is unusually strong for a single bond in a diatomic molecule.
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تفوقت في الاختبار على الجميع.. فاكهة "خارقة" في عالم التغذية
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أمين عام أوبك: النفط الخام والغاز الطبيعي "هبة من الله"
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قسم شؤون المعارف ينظم دورة عن آليات عمل الفهارس الفنية للموسوعات والكتب لملاكاته
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